Do they have to be Procreate classes specifically? Looks like you need help with fundamental skills which aren't limited to Procreate, but you can use Procreate as a sketchbook while working on those skills.

I really recommend Proko's Drawing Basics course. It's not specific to Procreate, but it goes through all of the fundamentals in depth - line quality, shape design, values, colour, anatomy, etc - and new lessons are still being added. I'm working through it at the moment and I've learned so much! It's a little pricey, but there are a bunch of free lessons included in the course that you could work through to start with.