Hello, this is my first post here.

I've had an electronic keyboard for some 8 years now in my room, but I've only practiced a few pieces on it and I can play them pretty well. Some of these are "To Zanarkand" and "More London Streets" if you want to find them on Youtube.
I had a few private lessons six years ago when I was 12, which taught me the major scales, the chromatic scale, and a little finger techniques. Unfortunately I couldn't keep my interest up back then, so I stopped taking the lessons. Now I'd want to take up piano again and learn more, so I thought this would be the best place to ask where I should proceed now.
I think I am pretty good at learning on my own, but my problem is that I don't know what I should learn and in what order. My goals are to be able to play pieces from the sheets (I'm not very good at it, I always looked up on Youtube to learn pieces..) and being able to compose something myself - if I were to compose something now, I'd have to do it via the tedious trial and error way, but I believe there are some rules on how to compose well. I think scales are the way to go and something else too, but I never got that far.
Any advice? I'll gladly answer any questions as well.