Welcome to CS! Your English seems pretty good to me. ^-^ Like 18 said, there's an International board, and we actually have a lot of German speakers including one of our moderators,
Sorren Fey. :3 There's also a few good threads to look at:
Must Read Topics,
Tips, and
Newbie Helpers. The Newbie Helpers can answer questions and direct you to threads and such if you need to find something (their names are in a salmon color). I think it'll help you improve your English, but if you're having trouble, I'm positive one of the German Speakers (mainly found in the
German thread in the International Board) wouldn't mind help you.