When I began drawing I found the Loomis Method very helpful. I have specific thoughts about what it is and why I am happy I began learning with it. Have you tried the Loomis Method and do you like it? If not lets discuss why and what problems you have had with it.
Drawing the Head and the Hands (PDF)
https://ia801403.us.archive.org/2/items/andrew-loomis-drawing-the-head-hands/andrew-loomis-drawing-the-head-hands.pdf