How do you work with your friends in this Jam? ( Me and my friends are quite new to this). Does only one person join and the rest help on that project
Well yes, you can do it that way with one person. If your friends want a page too, they can be added to the same game. When you have your game page up, you can make the other team members admin on the game page. Or you can just choose to take the easy route and just credit them on in the description or the game itself.
Good luck!