This is my building guide i use to play Corki, this isn't perfect but if you want make changes your allowed and if you got any suggestions that i should modify this send me a message,

Corki i find is fun firing missiles and machine gunning enemies down.
All i hope is this works for you.
Also if it does work send me some pics of your games so i can put them on here.

Pros:

Good dps
has armor so not to squishy
Owns mid - late game usually
Crazy funny to play
Probably will be main carry


Cons:

Squishy early game
If not use right can lead to death
Mana hungry
If your alone might be hard or if you got bad support
Team fights you will probably be targeted
Have stay in back.