yeah how to draw manga is really good. I have 2 of the books. One way of improving is having a good set of references. Start by trying to sraw something exactly how it is in your refrence (but dun trace well actually u can to have an idea, but I wouldn recommend trying to draw it on your own after tracing). Then when you get better you can change things like use a refrence for just a hand and not copy. So when u first start you can't exactly say it's your own becuase of plagerism and what not but it's a good start. It's how I started drawing. There's nothing wrong with references.