Welcome to the site! :)
What you want to focus on is creating solid foundations for your work. You can start doing in-depth, detailed anatomy studies and perfecting techniques, but if you lack the fundamental basics of motion and proportions, you're just going to end up swimming upstream.
I strongly recommend you focus on gesture drawings so that you learn to recognize the basic shapes of a body. Simplifying a body is a good way to become comfortable with it!
Check out these articles if you haven't already:
If you can master gestures and practice on those first, the rest will be much easier to follow up with! Feel free to post your practice session results here, we will do our best to give you pointers and help you out. :)