Thanks for your replies and your information!
I know taking painolessons would be the best for me, but I live in a very small village and as far as I know there is no piano teacher here. The city would be the solution, but it takes me about 2 hours to get there and that's too much time for me to spend on traveling.
For now it's the best for me to get a book about piano practising I guess. If someone knows a good book, please inform me about it.

Still I'm looking for some kinda practising schedule. I play the guitar too and I practised about a year with a practise schedule wich is used by a very good guitarplayer (Steve Vai). It takes about 1 hour to comeplete the whole schedule and I did that 5 times a week, for one year. It improved my playing a lot and I'm happy that I spend so much time in it. That's what I wanna do with the piano too. I wanna practise things like arpeggios, improve speed, scales etc, but I don't know where to start on the piano. So that's kinda what I'm looking for at the moment. It doesn't has to be a song or something, just little, maybe difficult things, wich can improve my playing.
I wanna spend about 45 minutes up to an hour to
only practising. After practising it's time to have some fun and play and learn pieces.
