Vayne has horrible attack speed early game. We get Berserker boots to help it out a little. Sheen's passive is excellent for Vayne's auto attacks. Madred's Razors are for easy mobbing. Then you build into Trinity Force. Get Madred's Bloodrazors, the Brutalizer if you need ArP. And Finish off with Phantom Dancer and Bloodthirster.

You don't need to max out Condemn, Silver Bolts' damage is excellent because it does true damage. You max out tumble ASAP so you get more mobility and damage from auto attacks. Get Final Hour when you can.

Ghost and Flash are the best for chasing and escaping. When champions try to run, you Ghost and catch up with ease! Or if they try to run around a corner, you can just Flash and finish them off! Ghost and Flash are also excellent escaping methods, you can Flash over Walls, and ghost to run away to avoid dying.

I have achieved 20 kills with <2 deaths.

Feeding vayne is very good, try to get as much kills as possible for gold.

Get red/blue buff at around Level 8. You should also take the time to help set up ganks on other lanes for your team.