Stefan. Welcome to our forum, you have received the bee fever, the addiction, you ain't seen nothin' yet.
This is a wonderful place to get answers to questions, you have already seen this. Ask all the questions that you can, we all learn by asking questions and the responses help out everyone involved with the bees.
Mistakes. Hmmm.....there will be lots, that is part of a learning curve. I can't count the mistakes that I have made in my few years of beekeeping, and they have all been the best learning curves. Successes are the best thing too, but man, do we learn by mistakes, hee, hee. Welcome, enjoy beekeeping and all the friends you will make on our great forum. Have a great, best, wonderful day. Cindi