So first for dominion you want to pick up berserker greaves with a vampiric scepter. Why no attack damage? Because your going to get lvl 2 wuju style and lvl 1 alpha strike. Try attacking mainly with team but in late game you should be able to easily fight off enemies.
When you get to the stage when your building your last whisper get rid of your brutalizer for it. If you dont have 30 masteries then just put them in offensive with ad and penetration.
Initiate with highlander and when you feel your taking too much damage to alpha strike so they cant attack you but you do damage to them.
Wuju Style makes you win...
My guide to master yi go win!