Tips on math rock/midwest emo guitar?

I’m doing a dumb challenge with some friends, and now I’ve got a week to write and record a song.

I could really use any advice, since I’m pretty new to playing this genre (though I’ve been listening a lot). I know the classic FACGCE and DADGAD tunings, but not much beyond that. Tips on amp settings, scales, modes, common BPMs or time signatures—literally anything would help. Thanks!