Pretty Straight-Forward build. Just follow it and no one can stop you.

Master Yi is easy to play. You can play around with the items. I recommend you to switch the Black Cleaver with another BloodThirster. When playing Yi, you shouldn't go mid. Go top or bot and get your berserker's greaves before you hide in the bush for a gank. Use your Q to farm, use it when theres a group of minions to make the most out of it. After you got your first Bloodthirster, you can go to other lanes and gank. In mid to late game no one can put up a fight since you have your ult and your Phantom Dancers. If your team isn't doing well pushing towers, you should be able to solo the towers yourself with your Bloodthirster+Phantom Dancer and using your ult. Pretty simple. Don't be afraid to confront a whole team if you have your full build already. You can hopefully get a penta-kill. Have Fun~