Rush Shiv, build sheen, grab cloak of agility. By now lane should be over. Grab boots (shouldn't have them yet). Depending on cc/ad build merc or tabi. Grab alac, not homeguards.
Roaming now:
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) You should be quick, doing picks, no teamfighting yet. As you get picks, put the money towards your zeal and your Edge. Should be pretty quick because you are juggling those items. Roaming/Laning over, teamfights more prevalent- build is:
(
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) (
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) depending again on their damage type. You WANT cdr, no armor pen (your ult does that), and bruiser stats. As you team fight, you want to probe- no hard engaging until at least 2/5 of the enemy team is below 75% UNLESS THEY ARE THE TANKS. That means you should toss Q and winds, no E, use shield to block deadly disengages. IF you are defending and not attacking (though yas is meant to aggro not defend), you can use your E carefully to get probs before recasting to get behind tower again.
My final Yasuo Build looks:
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)
. Depending on enemy team mobility, positioning, and general map awareness I might swap boots for
.
But this is all stuff I do. I'm totally not pro =P
Edit: I'm crazy, but I like my 200% extra Q damage, my mixed damage boosting, my 100% crit chance, and my reaction skill.