Biggems - the best way to get good in Toribash:
Go in free play to whatever mod you want to get better at. Invent your own moves. Start with a basic move like a sweep kick or something and then tweak it. Move body parts that you don't think matter (eg. If you're trying to make a punch, try moving your ankles, it helps generate power).
Also when you're making moves type in the command /sp 1. It's a speedometer. It shows the speed of your fastest moving body part (obviously if it's a punch your fist will be the fastest moving body part).
Aikido is a different story, however. I think the best aikido moves are ones that make your opponent unable to move. One that fractures a vital body part like a chest or hip, or one where you grab them in such a way where they really can't move. Try making a move that immobilizes your opponent, you'll be go in no time.
If you still want a teacher I can teach you, but I won't be more useful than developing your own style. After all, we're all [Legend]s here, and the best way to become one is to be original.