um idk if this is a good build or not? its just what works for me

im sorry about not having any of the items pictures and mis-spelling their names. i still havnt worked out how to use the picture in the build.

for my runes.
i go Armour pen for my marks and quints. it gives that extra bit of help at the start.

i go for As seals when i feel like it. otherwise i may go flat armour or dodge(change masteries to 21/9/0)

i go for MR/level glypths because it helps out later on because MR dosent scale with level

start of game
-boots and 3 hp pots. this helps corki stay in lane so he can farm longer and get to lv 6 quicker then his oppponent.

1st back
- by the time i go back i should ahve enough for a zeal. i will also pick up a few hp pots and some wards with the left over money

2nd back
with the attack speed from the zeal, you should be able to farm atleast 1650 before your next recall. just get a bf sword for you damage.

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next recalls
when i am back at base i finish off my bloodthirster and then look at the enemy team
if they are high in AD i will buy a more armour focused item, if they are more ap i will get either a banshee's or FoN. if its about even i will go for the aegis of legion. it give a fair amount of armour, MR and HP as well as a slight damage buff. most of the effect is given as an aura which will help your team out as this is the time of game when team fights start to happen

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after this you just have to decide which item you want next
i will get trinity force, Infinity edge, and starks favor... in no particular order
when/if you get full build just grab the elixars

farming with corki is quite easy. if you see a bunch of low hp minions pop your q of e on them making sure to last hit at the right moment
if you are laning mid. mae sure you use you (w) to jump over to the wraiths when theres a gap in minions. your qer can take them out quickly.
after a while you will be able to do it through the wall. saving your w for later