You dont have any experiences in making games and want to create a game with a team, which dont have any experiences too ?
For the mean time, I build the game on my own so that they're convinced about my intention regarding making a game;
Well, this would be a good idea, make a small game to learn what is necessary to actually create a game. One or two small games to start with would be a good idea....
I should stick with my friends. But what should I do next?
Well, this would be a good idea too, have some fun with a small team, try to motivate each other, try to teach and learn from each other. Make a small prototype.
Do you have any other advices?
If you dont have any experiences, dont try to make a commercial game (no reason to create a dev company). Try to learn and have fun, but as soon as money enters the stage, or atleast the ambition to earn money, it gets complicated, stressful and a lot less funny... Creating a game is really lot of work and the underestimated by beginners by far. Try to start small, with either small games or with modding an existing game engine. Both will help you to establish a feeling about what is needed to create a game.