@sun @augustus bad idea imo. trackers are very complicated and a hard way to learn.

use FL studio. it's nerd oriented and not tied to musician / theory thinking. it's very visual and easy to pirate.

start with loops. move on to copy paste change. then get into effects.

then just practice experimenting with the keyboard. start using it to record your riffs, then move on to jamming over looks

i know most people who use this method have fun and develop a portfolio. most people who try to learn music theory give up fairly fast and do more work then have fun.

I recorded this song one take in the middle of the night. it's not even one of my better ones, but I did this with minimal formal and theory training. just years of having fun. I couldn't tell you a single thing about what key or scale or anything.

on.soundcloud.com/GAV1V

also, stick to just the white or just the black keys if you have trouble staying in key. you can then use transpose (+/-1 shift) to change key.