Welcome Sebastian!

Hope you will enjoy your stay.

and I'll try not to ask stupid questions
These don't exists (but please ask google before posting ).

I used Game Maker which is not too much...
Game Maker is very nice for beginners. If you know all its concepts, things will go a lot easier.

banging my head against the wall for the stupid mistakes
Actually I'm about to do that right now. It's not uncommon behaviour for programmers.