Great job with starting out mapping with the action line and blocking in the head, torso, and waist that's already half of the work! I'd recommend the loomis method of figure drawing you can find videos everywhere and theres a book explaining how to add on after this building block layer you've already been practicing. Just make sure your proportions are right such as arm and leg lengths and torso and waist sizes which makes it a lot easier to build upon when things are already proportioned correctly. It won't look perfect when you start it will look disfigured but the more you work on it you'll subconsciously be able to build upon it easier, faster, and more accuratelty so dont stress out about it. goodluck!
