I have an advice.
Whatever style you want to learn:
learn perspective first and shapes/simple form in perspective, practice that every day even if it´s
boring, it will make everything easier
www.drawabox.com is the greatest course to learn that, it is not easy but try to make it at leat
past the 250 box challenge.
When you want to learn to draw characters/figure drawing then this is a good plan:
-gesture
-construction of the body with simple shapes in perspective
-when you are really good at gesture / construction then it´s time for anatomy (not everyone needs
to go crazy with detailed anatomy)
All the details like hair, eyes, etc will be easy when you know about drawing forms from step 1
Have a daily warm up
Do quick sketches
Have fun