Pros:
He has great farming skills.
Great poking skills.
Awesome harass.
Ult has loooooooong range.
Great escaping with Valkyrie.
Nice damage.
Trololol he haz a chopper? :D and awesome skins!

Cons:
Valkyrie has long cooldown (sadface)
Not 100% ad like many other carries.
Not so much health.
Chopper blows up when dies :(

Flash because its one of, if not the best summoner spell, good for escaping and initiating. You can you it to jump over walls, and combined with your Valkyrie, you should be able to survive almost any gank. Aslong as you dont get CC'd to your death.
Ignite because its good early/mid to get some kills. Its a very good idea to be aggresive with corki, and it will do a lot of damage when either someone helps you with a gank, or you gank yourself, and in the late game face, its good vs tanks.
Remember to use both your summoners, they help you!

You can also get exhaust instead of ignite or ghost instead of flash, but i wouldn't, unless you dont have any on your team with exhaust.

Pros:
He has great farming skills.
Great poking skills.
Awesome harass.
Ult has loooooooong range.
Great escaping with Valkyrie.
Nice damage.
Trololol he haz a chopper? :D and awesome skins!

Cons:
Valkyrie has long cooldown (sadface)
Not 100% ad like many other carries.
Not so much health.
Chopper blows up when dies :(

The reason we use so many mana reg runes, is because we dont get a mamamune. We save it, so we can get other items, while still have plenty of mana reg. Other runes are pretty self explanatory.

The masteries are also pretty normal for carries. Remember to take the 15% magic penetration, its really handy for corki the god. Some may run Utility for that extra mana reg, but not Candy, cuz he is awesome..

Passive: Hextech Shrapnel Shells - Corki's basic attacks deal 10% additional true damage to minions, monsters, and champions.


Now this is a very special passive. Your auto attacks deal ad (of course), all of your abilities but your gatling gun does AP and now this?! I mean, you have AD, AP and true damage with your passive AND ignite, so you can basically rape everyone. They need to stack, armor, mr and health, if they want a chance.

Q: Phosphorus Bomb - Deals 80 / 130 / 180 / 230 / 280 (+50% of ability power) damage to enemies in a target area. In addition, the blast reduces an enemy's chance to hit by 35%.

No doubt your best ability. The blind is sooooooooooooooo good vs other carries, and the ability also helps your farming alot. Its also a very very good harass ability, even though it can be a little hard to land, but after playing him for a while, you will learn to master it.

W: Valkyrie - Corki surges to target location dealing 60 / 90 / 120 / 150 / 180 (+40% of ability power) damage per second to enemies in the fire left along his path.

This is every carries dream ability. Tristana have an ability that looks like it, but somehow i like this one better. This ability have 2 uses. Either, to initiate enemies/chase, but be carefull, as much as it helps, it could be your death if they focus you.
The other use is defensive, which i use 90% of the time. If someone ganks you, or you just need to get away, valkyrie away!
Remember, (and this is very important) that you can valkyrie through walls!

E: Gatling Gun - Corki's gatling gun fires at all targets in front of him for 3 / 3.5 / 4 / 4.5 / 5 seconds, dealing a quarter of his total damage and shredding 1 / 2 / 3 / 4 / 5 armor with each shot. The armor reduction persists as long as the enemy is under continuous fire.

Good ability, good ablilty. This also have multiple uses. If you see some minions stacking, this is good. If youre chasing an enemy, this is good. If you gank, this is good.
BUT! Make sure you are IN RANGE! If youre not, it makes you look like an idiot.

Ultimate: Missile Barrage -Corki fires a missile towards his targeted location that will collide with the first enemy it hits. Each missile deals 125 / 200 / 275 (+30% of ability power) area magic damage.

Corki stores one missile every 14 seconds up to 7 missiles at any given time. Every 4th missile will be a Big One.

Aaaaaah, MESA LIKE DIES ONE! Unbelievable good ult with its good damage, very long range, and short/special cooldown. And its splash damage! Which means if the enemy champion is hiding behind minions thinking he is save, you can hit the minion and it will also hit him! Also, this is a very very very very good ablility for farming. Combined with your q you can take out melee and caster minions with EASE! Its also a good poking ability, and with its low cooldown and your runes mana reg, you will be able to use it a lot, and remember to use it! When chasing, this is also one the THE best abilities in the game.
Also remember, when you are recalling, unleash them all on the enemy, it will stack again you know.

If you go top or mid, start with boots and 3 health pots. If duo lane, go Dorans blade. On your first return, you should either get blade or boots, depending on what you bought first. After that, you will get your Sheen, and work on towards your Trinity force. On your way to trinity force, get either Berserkers Greaves or Mercury treads, depending on enemy team.
When your Tri force is done, Either get Bloodthirster or get a Banshees veil if they have a fed caster.
After that you buy the one you didnt buy before.
Now its time to shred the tanks, Either get Last Whisper or Madred's Bloodrazer
Also remember, to buy Elixir of Fortidude and Elixir of Agility, whenever you have bought a big item.
And remember to get health pots if you need, and also, that wards win games.

Flash because its one of, if not the best summoner spell, good for escaping and initiating. You can you it to jump over walls, and combined with your Valkyrie, you should be able to survive almost any gank. Aslong as you dont get CC'd to your death.
Ignite because its good early/mid to get some kills. Its a very good idea to be aggresive with corki, and it will do a lot of damage when either someone helps you with a gank, or you gank yourself, and in the late game face, its good vs tanks.
Remember to use both your summoners, they help you!

You can also get exhaust instead of ignite or ghost instead of flash, but i wouldn't, unless you dont have any on your team with exhaust.

Farm Farm Farm is all you do. Try not to take so much damage, especially if you are in solo lane. You can use your q to either harras, take multiple minions, if you cant get them all, or just damage as many as you can, if he is pushing. If your opponent tries to harras you, either you can harass him back, walk away, or valkyrie, if youre either at low health, or if youre positioned very very badly. if youre skilled enough try this:

When the enemy comes close to get a lasthit you go a step forward and then he has 3 choices:
1. Taking the lasthit but taking big hits since he used his AA for the creep and not for you(this may be the best method if he has a healer in lane)
2. Attacking you and missing the lasthit(this can be the most effecttive method though if you have no healer)
3. Going back and doing nothing, gratz you just denied your enemy.

Still all you do is farming. Remember, if youre lvl 6, also take some jungle once in a while, if you got the time. If you already have your trinity(which you should) try to compete in dragon/buff fights and burst the enemy carry out of lane if he wants to farm since you outdamage them by over 9000 at this point. Dont be too overconfident though.

Ye well what to say here, basically only baron camping/farming and teamfighting/pushing. Try to do everything.

In fights focus down whoever is staying first since at this point all what matters is how good can your team tank and how good can they protect you. If your tank is stronger then theirs you won. Simple. Also remember, if theres a team fight about to start, poke them before it starts with your ult.

http://www.own3d.tv/video/144544/Candy_Panda__id_7517__Archive__2011-07-05_11_35_23_-_11_59_07_
Theres a video of Candy doing the build.

Ill add more to the guide later. Please comment, and tell me if i have mispelled anything, or there is something wrong:)