I also use procreate and honestly all I can give is: experiment. There's a lot of brushes on there already, and honestly you're not gonna need most of em. Find a few you like and stick with em. I downloaded a brush pack by Jingsketch (literally just google Jingsketch brushes, and its one of the free sketch packs) and I use 2 of their brushes for almost everything. Also the brush dynamics on procreate are a little janky even for digital art, especially the smudge tool- it's more of a smear tool than a blending tool. So you may have to spend some time just learning how it works by experimenting with it for a while. Or do what I do with like 80% of my process- ditch smooth blends, embrace brush texture.
But yeah overall learning digital art is just a lot of tests. A lot of trial and error and learning how you use the program best. And some adapting your style and process to work with the program. The UI isn't super complex, I have faith you'll learn all that quick enough. Just mess around with it. Make some Experiment drawings and screw with layer settings, blend modes, brushes, the colour wheel, etc, until you feel you understand what they do and which ones you like. Just don't go into it expecting to make your magnum opus right away, it's ok to have a period of time where you're not confident with the program at all and are just learning and trying shit.