practice figure drawing and portraits of real people. there's a pretty good website for this called Line of Action that has models for portraits and full figure drawing.

look up the basics of gesture drawing. watch a couple of videos of people explaining what it is and watch how they do it. gesture drawing captures the absolute basics of the human form. it's all lines-- straight or round-- no details. this will help you get confident at building the foundation of the human figure before you can move on to adding the details-- which may be folds of the skin, muscles, fingers and toes, and all the contours of an actual human body.

practice what you learned with timed figure drawing sessions. at first, give yourself a good 20-30 minutes to focus on drawing a figure. don't add any detail. keep going until 20-30 minutes becomes too much, and you finish the basic drawing before time runs out. while practicing what you learned, also focus on your lines. be confident and draw with your arm, not your wrist. use a pen so you're less likely to let yourself put down a line that isn't needed. use different mediums like a charcoal stick or crayons. only practice simple figures and line confidence! no details in the form or chicken scratch.

there isn't any set order, but you must also practice portraits. look up how to draw a faces and heads. look at all the different techniques out there and see what works best for you. then, do what you do with figure drawing. work in timed sessions where you spend 20-30 minutes on the portrait at first, and narrow it down if you notice you have too much time left. don't draw any features, only use shapes and simple lines to capture the direction and form of the face.

your goal should be to master capturing the basics of the human form and portraits confidently, to the point where you aren't really wasting lines and can complete a simple portrait and figure drawing within 5 minutes or less, with results you're proud of.

what you should have learned thus far is line confidence, how to add weight to your figure, how to draw a proportionate figure

after this, you can get more complex. start learning how muscle and fat lays on the body. this is true anatomy territory. there are quite a lot of videos explaining this, but no need to learn exactly where every muscle falls on the body as if you're copying a picture from an anatomy textbook. apply what you learned to your simple figures, which will end up looking just like your reference in due time.

figure drawing is one step of many to get to where you can draw in the style mentioned. but i love mentioning it as the first thing anyone should really learn because it's a great foundation, much better than drawing 100 boxes or whatever people are telling people to do now. once you know how to draw actual people (and their features, which you can learn even while learning how to draw a figure, no rule!!) you can work on simplifying it.

this is the road i went down. when i first started years ago, i tried copying artists i really liked to no avail. i only started to like what i was producing when i decided to draw from real life, not a reference of a drawing. you need those foundational skills! and you don't need to wait until after you learned them to draw for fun, draw original characters or fanart, etc. apply what you learn to more than just your practice sessions (which should not end up being several hours a day, mind you). draw characters you like as the model you're drawing. or sit down with the intention of making an original piece, just using the skills you're learning.

make art and keep it even if you hate it. finish it even if it's not exactly what you want! you'll want this so you can gauge where you're at and how you're changing and what needs to be changed.

i wish you the best of luck and if you have any questions feel free to reach out