Hello and welcome!
I suggest - take your time and explore the game slowly. Get to understand how all the different stats of the fighters work together, learn how to assign groups, and so on.
And of course, here on the board you will find a lot of threads ( for example this one:
https://forums.ootpdevelopments.com/...splay.php?f=56) with a bunch of great universes from our members to get some ideas from.
We're always glad to see some new faces around!