Hi my IGN is SunSoaked I really don't play ranked so if u look and see my rank you can tell. Anyways to the thing you came for, yasuo he's all around a good champ and I think you will like him when you get god with him. One thing to note is that you have long team builder queue is long and he is banned in ranked a lot people don't like him rekting their faces.
Runes and masteries
The masteries above are all u need and all ive ever needed. The runes are basic you can have pretty much what you want but if your not to sure just go with what I have up there.
You have many of combos and none of them are hard but they are, q+e stacked q+e+r stacked q+r that's pretty much it sorry but if u watch the champion spotlight it explains.