This is the first game jam i've ever joined. Does anyone have any tips for new timers like me?

I'm also new. I suggest planning and not worrying. You can first make the most important features of the game, and then add smaller things on top of it.

I'm a beginner too, but I will give you some advice, have fun

Here's a tip: Make sure the core mechanic is good. If it's not fun, not only will the game not be fun to play(obviously), but you will also find it hard to get motivation to work on the game. Really make sure you are passionate about your creation.