Quick Thing Before I get started
I am and always be working on ways to improve this build, so if you guys have any suggestions, feel free to comment them or something.
Build all three of the basic skills first off, then pump your points into W until level 6.
Divide them up from there. I find W is really useful when in close range situations.
First things first, Lich Bane is essential for early game pwnage, because of the AP and damage.
After that I would build Phantom Dancer, because of the Attack Speed and Crit Strike percentage.
The you could do Bloodthirster or Maw of Malimortus, which ever you feel owuld get your damage to where you want it to be.
Finally, as an extra slap so to say, you could build Trinity Force. More AP, more dmg, and more of that delicious attack speed.