I've found that the how to draw manga books tend to be a bit on the expensive side. I would rather spend my money on art supplies instead of buying a book that teaches you how to draw in a certian style. The most important things you should learn how to do are these:
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Learn how to draw people. You can look at books all day on drawing anime characters, but until you learn enough about people and how to draw them, your anime characters may not look believeable... unless you're drawing chibis. Usually the only thing that tends to differ in my anime art from lifelike/realistic people is the shape of the face, eyes, nose, mouth and hair. I spend more time trying to get my bodies to look believeable. I look a lot at reference pictures, and my own feet and hands while drawing.
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Learn the Key basics about anime style Once you learn how to draw certian key parts of anime, the rest will come easily. For me, it was always the eyes and nose and especially the hairthat took the most work. Anime is not much different than cartooning more realistically proportioned people. You're just changing features on the face.
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Develop your own style You can draw all of your Sailormoon fan art and make it all look exactly like Sailor Moon. You can draw all of your characters so they resemble DBZ in style. However, I've found that your art won't truly be appreciated until you're able to develop your own style. This is coming from a person who has been selling artwork at anime conventions for about two years. If you really want people to take notice, you have to make your art stand out from the rest.
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Expand your Horizons Instead of just drawing anime all the time, expand your horizons by attempting different media, and even different forms of art all together. Try fantasy or sci-fi art. Try pure realisim. Try abstract art. In the end, it will help to improve your anime art as you become a better artist. Also, I've heard of people who have gone to art college in recent years for the sole purpose of wanting to be manga-ka (manga artists). Well, I hate to burst anyone's bubble, but that isn't very profitable. Everyone wants to be another MegaTokyo (an american manga). You must realize that anime art is just another style of cartooning. If you want to be a real artist, you have to experiment and find other mediums. I've been drawing anime since 2000, but I only see it as a hobby. I enjoy it, but I know I won't ever make a real living from it. You must be realisticly minded when it comes to this.
All in all, you don't really need a book to tell you how to draw in this style. There are so many excellent tutorials online for free. I'll link a few of them for you. =)
http://www.howtodrawmanga.com/tutorial/tutorial.html
http://www.rydia.net/kathy/home.html
http://www.bakaneko.com/
http://members.tripod.com/~digityze/howto/index.html
http://omu.kuiki.net/
I've also found that studying other people's art and the way they draw and shade certian parts is very helpful. I don't copy anyone's art, but it's useful for both inspiration and help when I'm stuck on ceritan things (like making eyes look right)
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