What can I learn before I actually go to flight school (Austria)?
Get hold of a simple simulator to familiarize yourself with the basics. I enjoyed Microsoft FSX . It's not intimidating. You can follow along just getting the basics, and you can hear generic pilot talk. It's not going to guarantee you a jump start hours wise, but at least when you get to flight school, you may have heard some of the terms and even messed with certain controls. 

Don't expect to skip ahead without serious time investment. A few hours playing on a simulator(emphasis on PLAYING) will help with familiarity and maybe confidence, but be prepared to spend a lot of time listening to your instructor.

Another good thing, though it sounds silly could be to invest in some training videos. I personally enjoyed the courses offered by sporty's pilot shop. It was $200 when I bought it, but I would argue that it paid for itself, since I needed less time paying instructors and renting planes to practice things. 

On the other hand, sometimes you hear instructors say they prefer blank slates as opposed to people coming in with bad habits. Maybe be patient and wait until your instruction begins. That way you start off with the habits that your specific school likes to train.

Good luck!