How does corki supposed to be good?

It's an interesting question, but I just re-rolled into corki so I tried it out, and I know different champions have different playstyle, but when I played it did no damage. I was 1/2/0 with a decent amount of cs (the highest in the game) at that point I had trinity, rfc and sorc boots, my q did nice dmg but my other abilities did nothing. Everyone says corki is an excellent champion and I know the probelm is with me, so you guys can you share your tips with me? I used general ad runes, warlords, and I know void-stuff is good item on corki.
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