Practice practice practice, Check youtube for beginner moves.

Edit: almost forgot, You may check the in-game tutorials under fightschool, If you think easy is to easy. Try advanced
try practising in free play a bit then go onto multiplayer. if your move doesnt work well, look at things you can improve in it
Try to pwn you in single player mode. Save good peoples replay and while watching the replays press shift+P and "E" and study how the joints are. fight more people. and earn more Qi.