>>57002092thats actually a good start anon. even if you have 1 or 2 hours to practice, there's a shit ton of things you can learn just by observing your surroundings and try to decompose things in your head. You are on the public transportation and see a guy with a funny hat? how will you draw that hat if you have to use basic geometric shapes only? how the lines have to cross in and out to form that curious folding on the side? where's the horizon line goes behind that building?
then on paper try to do a lot of still life, but no details (thats for later) only basic shapes interacting with each other to form more complex shapes, and finally objects. your skeleton thing its good for that, but can be done with literally any junk you have arround the house. fill pages of it every day.
good luck anon, and have patience.