Over the internet I found some posts and informations about youoption.de and I tried them.
I looked closer to the website of youoption.de. Everything looks good, the broker is regulated by Cysec and they have a address in Germany.
I started with 1000€ trading on the platform from youoption.de. Low costs, many assets to trade and a good service. I think, that youoption will be my main broker for the future!