These are simple tricks to optimize your combat ability.
1) When you begin, on the touch screen all you can see is your spirit deck. If you tap the button that says "change" you'll see 2 cards and a list of buttons that say SP (Special) or SU (Super) If you hit these, you do the special. They are all numbered, and some characters have more than others.
2) Always get in the first shot because it makes the Super Meter (I think that's what it's called) under your health go up 1. The higher the #, The max is 3, the more super moves you can perform.
3) Finally, don't hesitate to block! If your opponent uses a super or special, and you don't block, you will lose a chunk of your health. I hope these helped.
Submitted by Ichigo Kurosaki (Creative name, right?)