Welcome! This is my first guide i wrote and it's about Tristana.
Tristana is my main Ranged AD Carry i play. This build is what i use so far when playing her. This build is expensive but Tristana is very good at farming and can get some items quickly even if you didn't get fed. This build is really focus in damage and play with crit.

Some people that are new to Tristana may wondered, why focus on AD (Attack Damage) rather that AP (Ability Power) ? Most of her skills using AP! :o
Because all of her skills have a long cooldown and not very hurts either, and even if you stacks Rabadon's Deathcap , AD Tristana hurts a lot more that that.

Tristana is a not hard-to-learn champion, but some practice is also needed though...

PROS:
- Really high DPS
- Can outranged most of other champions (Because of Draw a Bead)
- Good escape mechanism with Rocket Jump + Buster Shot
- Have a free 90% Attack Speed Steroid with Rapid Shot

CONS
- Very squishy
- Very slow movement speed
- Very item dependent

Runes set :
- 9 Greater Mark of Critical Chance
- 9 Greater Seal of Critical Chance
- 9 Greater Glyph of Replenishment
- 3 Greater Quintessence of Critical Chance

From the CrC marks, seals and quints Tristana has gain about 18% of Critical chance without any items. This is like a free Cloak of Agility :D. This may become a big help at early and mid game and you can maybe get the firstblood.

Most people are using Armor Pen runes for Tristana and that's a good thing also.
I didnt have IP to buy a set of Armor pen runes so i didn't tried it yet. My runes was all CrC because i was playing Tryndamere before :P . But it seems CrC still can fit well for trist.

The 9 Greater Glyph of Replenishment are for Mana Regeneration. At early, trist may out of mana when spamming Explosive Shot (Active) for harassing. Or when being chased down, Rocket Jump + Buster Shot is costing some mana D:

For Masteries, a 21/0/9 is the best choice for Tristana because Tristana plays offensively as a huge damage dealer for your team.

Deadliness Is quite useful for it's 2% Critical chance. Max it.

Cripple This is a must-have if you are an Exhaust lover.

Alacrity provide you with 4% Attack speed. It's good to have.

Sunder penetrate 6 armor, nice to have for early.

Havoc is very good Mastery... A must have to all offensive champions.

For summoner spells, i highly recommended to use:

+
Exhaust + Ghost

Exhaust and Ghost can be used in offensive and defensive ways. If a group of enemy champion have ganked you, which is a very bad thing for a squishy like you, and sometimes rocket jump is not enough... So use ghost for running away faster and if your HP is really low and if the ganker keep chasing you, exhaust. Exhaust can be used to slowing an escaping enemy also.

Other recommended spells (Good to pick):

Ignite
This can really useful to finish a low-HP remaining champion that running away.
Combined with Explosive shot active, it deals some amount and damage and it prevents enemy to being healed, whether it's from Heal spell or from a healer.


Cleanse
This is a good pick if enemy have a stunner like Taric or Sion. Use this and quickly rocket-jump can save your live from danger.


Teleport
Choose this if you pissed of Tristana movement speed.
Teleport is very useful for defending an unguarded turret or ganking too.

Not recommended choice (Bad to pick D:) :

Flash
Use this after Rocket Jump will get you really far away from an enemy. But because of it's really long Cool down it's not really useful. A single rocket jump is enough, if not, use Buster shot.


Smite
You are a good at farming... its useless for you

Claivoyance
Clairvoyance
no


Rally
It's for support champ...


Fortify
It's also for support...


Clarity
You are not mana hungry with some runes, so dont pick this


Revive
lol...

Passive : Draw a bead
Increase Tristana's Attack Range as she levels.

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A pretty good passive to have. Tristana is probably the highest auto-attack range at lv. 18. Fits perfectly for a carry.

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Skill Q : Rapid Fire
Increase Tristana's attack speed by 30/45/60/75/90% for 7 seconds.

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A free 90% attack speed... This really maximized your auto-attack damage output.
Use this when facing enemy champions, you can takedown some champs quickly with this. And don't use this when farming creeps. It's a waste of mana, and it's have a quite long cooldown.
This skill is doesn't needed for farming at early, so this will be maxed after you got Explosive Shot Level 3.

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Skill W : Rocket Jump
Tristana fires at the ground to propel herself to target location, dealing 70/115/160/205/250 (+80% of ability power) magic damage and slowing surrounding units by 60% for 2.5 seconds when she lands. On a champion kill or assist, Rocket Jump's cooldown resets.

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This is your main escaping ability. Other than escaping, its also really useful to commit a surprise attack. Why? You can jump over walls! Using Rocket Jump and combined with Buster Shot towards nearby allied turret is a very good ganking strategy. The damage is not very useful, so don't use it in teamfights for attacking. And NEVER jumps into a group of enemy champs. You will be dead for sure. However, the slow is quite useful to. Use it when the enemy is running away and you think you can win if you chasing him. Remember, cooldown resets when you kill an enemy champ... thats a good thing. If you were killing someone but suddenly enemy coming out from nowhere (Trap), use Rocket Jump away.

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Skill E : Explosive Shot
(Passive): Enemies explode when slain by Tristana's attacks, dealing 50/75/100/125/150 (+25% of ability power) magic damage to nearby enemies.

(Active): Explosive Shot rends the target enemy, reducing healing and health regeneration by 50% and dealing 110/140/170/200/230 (+100% of ability power) magic damage per second for 5 seconds.

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This skill passive is very useful for farming. And the passive also can damage your lane opponent when you farm. The active is pretty good for early also. Use the active and 1 auto-attack to your lane opponent to harass. But never use the active to creeps. It's a waste of mana. This need to be rushed first to farm well. But level 3 of this skill is enough, and at mid-game Rapid Fire is more important. At late game, the damage is not very useful as your auto-attacks is a lot more hurts. But the health regeneration reduction is still useful. An enemy Warwick with tons of life steal? Or a fiddle using Bountiful Harvest to you? Use Explosive Shot (Active) + Ignite when needed. You can win.

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Ultimate R : Buster Shot
Tristana fires a massive cannonball at an enemy unit. This deals 300/400/500 (+150% of ability power) magic damage and knocks surrounding units back 600/ 800 1000 distance.

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Your ultimate, Buster Shot is making a big punch at early-mid and have long knockback too. But still, the damage is not very useful at late game, your auto-attack hurts a lot more, but the knockback still useful for Rocket Jump + Buster Shot combo or when escaping. Careful about the knockback, don't use Buster Shot when your team were chasing enemy champs with a lot of HP remaining, if you do, you just helped the enemy getting away. Make this as a finisher attack, at [Buster shot]] level 1, use this for an enemy champion with less than about 200 health. Or, if you can use Rocket Jump behind your lane opponent and use Buster Shot towards your turret. Then use Rapid Shot and auto-attacking him. There is a good possibility that you can kill an enemy with this.

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So, your skill order is:

1. Explosive Shot
2. Rocket Jump
3. Explosive Shot
4. Explosive Shot
5. Rapid Fire
6. Buster Shot
7. Rapid Fire
8. Rapid Fire
9. Rapid Fire
10. Rapid Fire
11. Buster Shot
12. Explosive Shot
13. Explosive Shot
14. Rocket Jump
15. Rocket Jump
16. Buster Shot
17. Rocket Jump
18. Rocket Jump


Explosive Shot (E) is really needed to farm at early, so raise it up to level 3.
Level 3 of it is enough for farming and Rapid Fire is a lot more needed in mid game to killing enemy champs.

Rocket Jump (W) doesnt need to be rushed, level 1 of it is enough. The damage is kinda not big at all.

Rapid shot (Q) need to be rushed after rushing Explosive shot. As in mid-late game this is your bread and butter.

Tristana's core item is different in some situations.
This is when you not having so much trouble when facing your enemy.
By so much trouble means like there is only 1 that can stun/snare you, only 1 tanks or most of them are squishy. Remember, the squishy is your food. I remember that i have killed Heimerdinger or Master Yi within 3-4 shots with these core item.
(I think lol :P)




But what if there is some stunners? Like Annie, Sion or Taric?
Exchange 1 of your Bloodthirster into Banshee's Veil

And what if most of them are tanks???
I rarely using these sets, because usually i can kill tanks in no time with the default set. This set is still useful when most of your enemy is tanky and stacking armor.

That's all for the guide for now, i will add Playstyle, encountering enemies, and full guide from early game into late game.
If you Downvoted this build, please give a reason why :D