Short answer: the usual answer is to start with a classic, simple game like Pong. If you see a lot of beginners making Pong games, that's due to an old article by a well-known game developer advising exactly that.
Of course, you don't have to literally make Pong. Shoot'em ups are very easy to make, if hard to make fun; other people recommend platformers, or falling block games. Visual novels, too, if you can manage the art requirements. Or heck, text adventures.
Either way, make the games you want to play. That's key. If you're not very fond of playing games, then why bother making any. I had surprising success with roguelikes and text-based RPGs, and in certain circles even with text-based strategies, before I moved on to making tools.
Speaking of which: try other tools, too. See what works for you and your team-mates, and can produce games you like without too much effort. Don't put your eggs in a single basket.
Just don't set your expectations too high, because making money from games is hard, never mind making a living. Good luck, but have a plan.