But it is recommended to study the basics first. In this case, first study how to draw the greco-roman figure, the "perfect" model. Once you know how to draw it (understanding anatomy and figure drawing from various angles, positions and in different perspectives), you can distort it, which characterizes one's style. I won't talk much about style because it's kinda compex, but it usually comes naturally and can be further developed as well.
By the way, during all your journey, you'll be constantly revisiting the principles. There's always something new to learn and something important to remember.
I recommended Andrew Loomis' books because he covers such subjects really well and studying by his books is like having him by your side, pointing at some page and gently saying "pay attention because this is very important".
Successful Drawing is great because it covers the basics very well. If you don't know where to start, start from this book.
Also, Figure Drawing for All it's Worth greatly covers anatomy and figure drawing and approaches this subjects in a wonderful way.
I'm saying this because once I was lost among many many books and i didn't know which one to pick and study from. Then I found Loomis' books and they were the answer I was looking for. So, I can tell you with no doubs: if you don't know where to study from, study by these books.
As mentioned above, study color theory as well and there are other materials that may be useful too.
I'm also recommending this site: Ctrl+Paint. It has the most pro-level free video library about drawing that I've ever seen. The material is really top quality. It approaches traditional drawing, then a transition from traditional to digital and finally digital painting. It's not just divided into those three parts; each part has many sections addressing a specific topic and that's simply wonderful.
Also, if you need some motivation, go to the last two sections. They have great videos that'll help you a lot.
As a final message, I'll tell you two things that I've heard many times (and that I still hear):
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Focus on the process, not on the final result. Because being worried about the final result may result in stress and consequently not being able to work well because you'll be analysing your work as it is in the middle of the process, which is not complete, of course, and thus may make you take wrong conclusions about your goal. Think about this especially while studying and training.
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The best works aren't done in a rush. Good things take time to be finished. This took me around 3 hours and half to color. Of course, the more skilled you are, the faster you may work, yet things take time to be completed.