Katharina! First, congratulations! You should be very proud of your accomplishment.

I've started two clubs/teams over the years (both still in existence). Velo Girls is an all-women's club and I also started a high school mountain bike team. I'd be happy to advise you, answer some questions, and possibly be able to hook you up with a coach in your area who might be able to help.. Shoot me a PM with your email address and we can exchange contact info.