Nevermind, I just found the tutorial, I'll work from there.

I have Sawndz and Brawl box, though I really don't understand how to get any progress done. I'm trying to use the Sho Minamimoto for Pokemon Trainer sfx, though as said, I have absolutely no idea on how to change this. I have a smashbros_sounds.brstm file already that came included in a mod I already have, so getting that file is one step done already, but what do I need to do to use the sfx hack I want to add in?