Hey, haven't really started yet, but also a beginner. My advice would be maybe try to watch some youtube videos (it's what I'd do) for things that you may want to improve or don't know what to do.
Also, wanting to take advantage of the situation here. Is it ok to submit unfinished work? Or if I don't finish it but still want to submit it completed, would it be ok to do it after the jam? This is both my first time making a game as well as my first jam.