Man, It doesn't matter what level of beginner you are. For game jams in general. I did my first jam with only a couple weeks of UE4 experience under my belt, and I learned as I went. Here's my secret: Google. Literally anything you don't know can be found on the internet, whether on youtube, some random forum like reddit or stack overflow, and If you can't find it, just ask! The internet has many kind people that would be happy to help out! Game jams are in my opinion the best way to learn game development. So have some fun! Learn from your mistakes! And I hope you do well in the jam. Good luck!