Can i make art assets like 2D sprite or 3D models before that the jam is started and then actually use them into the game?
This is my first Game Jam, but I have watched a few, and it seems that (on Unity at least) you are allowed to make the materials, so if you have a colour or texture that goes with anything, then maybe try that.
I on the other hand, will be doing no learning about the coding and stuff for another day or two...
So expect a terrible game.