Mr Park. There are two fundamental ways to do a fanfic tournament.

Either you let other people sign up and send in their tactic for a fight, and you write a nice story on how the fight took place and who won and so forth.

Or you make one up on your own, but then you really need to write the fights in a more interesting style or nobody will bother to read it anymore.

Either way its up to you to tell the story, not just a summary of who won what.

Its up to you of course, but this way will not get you very far.