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Below is my way of choosing and reading tutorial & reference books, just some personal opinion, and I'm a beginner myself :P

1. Don't try to collect everything you come across, but also don't just get one book and think it's enough: Too many books would cost too much time to read and bog you down both physically and mentally. But sometimes reading another reference book gives you new ideas, which often lead to major breakthroughs. So a good tactic is to get a few books, choose one as the primary one and practice according to it carefully, and read through the rest and see if you find something interesting.

2. Choose books with examples that have rough lines. These lines are important guides to constructing a body that looks right. But don't try to totally replicate the way how a professional do this, they often look simple but is actually quite difficult. For example, beginning with the spine and shoulder, waist and hip lines is a method taught in many books, but I find it less friendly to beginners than beginning with two cones.

3. Some parts are of exceptional visual importance deciding whether a dessin looks right or not.Try to gather these knowledge and take memos from books, forum threads and pixiv tutorials et.al. For example: The key to drawing a wrist is to remember that it's narrower than the lower arm. This looks like knowledge everybody readily have, but applying this to drawing is another thing.

4. Realize the difference of drawing genres clearly. For example, manga art usually have much longer faces than galgame art (In other words, galgame art uses the loli end of manga art). By this I don't mean that you can't learn to draw galgame art from manga tutorials or vice versa, but realizing this beforehand saves time .