your starting items you should get a dagger and a few health potions.

If you are going Rakan top you need to ban Urgot... But if not... Ban Nasus

To start your build you need to buy Runaan's Hurricane, Guinsoo's Rageblade,
The Bloodthirster, Statikk Shiv, Nashor's Tooth, and Essence Reaver.
But if they have a tanky team, you should get the Lord Dominiks's Regards.

To start out, play safe and skill shot your q... Gleaming Quill. Then once you've lowered the persons health enough, knock him up with your w... Grand entrance. If under attack in tower the ult and w for the kill.