(Early Game)
Your main goal is to farm and look for wall-bangs with Condemn. All-in on a wall-bang and you'll win the lane. Other than that you want to dodge every damaging ability you can with Tumble. Harass safely with Tumble and farm up. A decent trade early game at near full mana is to auto attack, Tumble to the side, and then Condemn them and run away. Even if it doesn't proc the second part you get the Silver Bolts proc. At level 6 you get decently stronger but you need items to actually duel people. The mid game is where you shine.

(Mid Game)
You'll want to run off into a sidelane with a Vision Ward when there isn't an objective and place your pink. If you're purple side put your pink in the river brush. If you're blue put in Tri-brush. The denial of vision is going to help you an insane amount. They'll be scared of jungle pressure and you'll have a bush you can safely camp in. Group with your team when an objective is coming up and stay in the back of fights to deal as much damage as possible. If the enemy team grouped earlier than yours then you can go for a flank on them. Vayne flanks are pretty good since you can stealth around and get a free wall-bang.


(Late Game)
You'll do loads of damage to anybody you hit. Thornmails don't apply to you since your actual AD isn't that high. Focus the highest threat near you and Tumble around!!