Hi everyone! Im Weiwing and i've been playing League of Legends since the end of the summer 2010. I wanted to make this champion guide because i think it's really good (I think it's good)
Please read everything before you vote.

Pros

+Good escaping skills
+Long range for hit and running
+Huge Damage with passive
+Ultimate range to kill low players
+Great Damage early game with Headshot and Piltover Peacemaker

Cons

-Not really good in teamfights
-Her traps ( Yorlde Snap Trap) are big and very visable unlike Nidalee's Bushwhack / Pounce
-Squishy
-No mana early game and late if you don't buy it late game
- Shaco can use his Hallucinate to evade Caitlyn's Ace in the Hole

This is a really important chapter
You should go Bot Lane with a support.

Buy this:
Doran's Blade "FARM 2000g" 2075g If they have jungler and buy a Sight Ward if your support doesn't have that many wards
Go back Recall
B.F.Sword and Boots
Back to lane
Berserker's Greaves
Pickaxe
Infinity Edge
Dagger
Negatron Cloak
Cloak of Agility
Zeal
Phantom Dancer
Ruby Crystal
Banshee's Veil
Zeal > Phantom Dancer

And now you have to choose between
Black Cleaver, Bloodthirster and Madredz Blood Razor

1.I Recommend Bloodthirster

2.But if you really need armor penetration buy Black Cleaver and if you want sell a
Phantom Dancer and buy a Last Whisperer

3.BUT!! If the enemy team got alot of Health then you could buy the 2nd DOT's item choices. But Madredz Blood Razor gives you the thing you need when they have alot of hp.

Spells you could/should take:

Ghost You have your E so you basically don't need Flash and Ghost makes you more of a carry

Exhaust Youre and AD Carry why wouldn't Exhaust be good?

Teleport This lets you come back to your base and buy items so you can farm easy with your new items.

Ignite I don't recommend this but you could take it if you focus on harrasing and not farming minions.

Heal If you are a total noob and die all the time you should take this and ghost because when i was new to the game i always took heal because it made me never die!

Cleanse This would be good but you are going to get Banshee's Veil later

You shouldn't take:
The rest ofcourse but heres the reason:

Revive Only trolls who feed usally takes this and you shouldn't die when you are farming bot.

Smite You could take this BUT I WOULD NEVER RECOMMEND IT. If you take this you will push more and people will think that you are trolling or jungling

Fortify Usally Tanks who are lvl 10-25 take this.

Clarity You want to have mana but don't take this. Tell your support to buy Mana Manipulator and you'll be fine

Rally Don't troll with me

Clairvoyance Your support should take this

It's Basically that you upgrade like this

-5x- LVL 1
Piltover Peacemaker For alot of Damage

-5x- LVL 2
Yorlde Snap Trap For DoT (Damage Over Time) and Snare

-5x- LVL 3
90 Caliber Net You just need 1 point on hit for escape

-3x- LVL 6 11 16 (whenever you can)
Ace in the Hole

When you are jungling ALWAYS REMEMBER too stand in the closest bush.
But you don't need to stand in bushes when killing the Wolves, Wraiths, Dragon, Baron Nashor and the Golems.
There are bushes for Golems and Wraiths but you don't really need them mid-late game

Q: Why should i stand in bushes?
A: It activates your Passive which is called Headshot. You can read what it does by holding your mouse over it.

Q: What should i do in teamfights?
A: You should just auto-hit someone if no one is on you.

Q: What do i do if someone is on me?
A: You have so much movement speed so just hit and run and use ur E skill 90 Calibur Net

Q: What skill order should i do?
A: Lay down some Yordle Snap Traps and shoot your Piltover Peacemaker and then use your 90 Calibur Net When you need to escape.
Remember to be very observing and use your ultimate Ace in the Hole When you see that someone is low on HP

Q: My Position?
A: An AD Carry should always be in a Bush or come from behind the other team. Don't engage.

Q: Who should i focus?
A: Feel free to focus anyone. But i would focus the one who takes the most damage or if i come from the back i would just kill them.
You could also ask your team who you should focus

If you can't gank the other team in teamfights you should stay behind your team if it is late game and you have full build or Infinity Edge and a Phantom Dancer. Those 2 items deals alot of damage.
But if it goes bad and you don't deal damage you can just be cocky and shot at them but not too much.
Try to never die because you are the ad carry!

You can always change the runes.

I have chosen now:

Greater Mark of Desolation Armor Penetration

Greater Seal of Replenishment Mana/Per 5

Greater Glyph of Attack Speed Attack Speed

Greater Quintessence of Desolation Armor Penetration

You can take:

Mark:
Greater Mark of Critical Chance
Or
Greater Mark of Attack Speed

Seal:
Greater Seal of Vitality

Glyph:
Nothing at all ATK SPEED is good in my opininon

Quint:
Greater Quintessence of Attack Speed
Or
Greater Quintessence of Critical Chance
Or
Greater Quintessence of Attack Damage