Just find a problem you'd like to solve and start working on it. My problem is that I keep thinking of new features I want to add along the way. Right when I'm ready to release something I always feel like I really need to add just this one more feature for it to be good enough. The project I'm on now was supposed to take a month, I'm in my 6th month now. But I think I'm almost done haha.....

For my next projects I'm going to try to work on some smaller things I can hopefully finish in a weekend. I feel better about myself when I complete things, which motivates me to keep working/learning new things.

Good luck!