Alot of noobs and maybe good people are having trouble with animating movement, or inspiration for nice move's.
Even though its pretty stupid to, the best tip is to watch yourself in the mirror how you punch, and how you like to make a combo.
Look how you stand when you are fighting, look how you love to run, bend to the ground, or standing right up.
How do you move your arms when you run.
If you figure this out, and use alot, you are half way on your animation, I think.