Street Fighter 3 Third Strike Moves, Characters, Combos and Strategy Guides
This might be the best Urien match for learners http://www.youtube.com/watch?v=HHk-Xkk9i_8 Not because it's a beasting but because it has every Urien staple setup beside the corner one we've all seen hundreds of times. It has everything. Aegis as a Shoryuken meatie, Aegis-less corner combos, mid-screen Aegis mixups, using the fireball to keep the opponent in the air for another move. It's almost a showcase by RX.

Yang: Street Fighter 3 Third Strike Strategy Guide and Moves
Anyone with trouble landing all five hits of the EX Mantis Slashes on the stick can do five fast 360s instead of five quarter-circle forwards.

Yang: Street Fighter 3 Third Strike Strategy Guide and Moves
So I hope that's a good start. Use Yang's agility with his main tools to keep your opponent guessing. Create custom combos with win-win situations. You always want to think like this: "If this hits I can do this, if the opponent blocks I can do this. If the opponent blocks THAT I can hit this."