I mostly "main" Yasuo if you think about it. I found that buying the three tier III Critical Damage Quints help alot to counteract his passive, then Full AD Marks, Armor Seals, and MR Glyphs with mabe a few CDR.
With Yas, it is Essential to know where escape is at all times. Using his E will help you get of of ugly ganks that could've turned for the worst. Keep an eye on minons, and if you go in on an enemy, make sure you will be in enough range of a minion to E back, whether it is for a bit of poke with your Q, or if you go in, and get ganked at the same moment,
Try not to first pick Yasuo like all the other idiots. He is a completely counterable champion, and will get wrecked in lane if counterpicked.
Know your strengths. If you do get countered, try to play safe, but know when to go in and destroy your enemy.
Always try to keep Q stacked. it is a great source of poke with your Whirlwind, and a gank counter.
You'll most likely learn a lot more on your own, as alot of this I learned myself. Good Luck in the Fiields of Justice!
~Dungar