This book is a good reference for cutting edge CG methods. It has some basic drawing tips, tutorials on coloring in different programs such as Photoshop and Corel Painter (if you use any other programs than these dont bother with this book), and covers cell style shading, airbrush style, and "digi paint" style. The latter, airbrush and digipaint, is very vaguely covered. Most of this book is about cell style shading very generic anime style characters. And I do mean anime style, not manga style, as I think this book is mistakenly titled. It doesn't contain any information about using the computer to color in black and white manga style.
If you're completely new to this type of stuff, don't get this book, it'll just overwhelm you. This is an alright book to have on the shelf for reference but it doesn't contain anything you can't get by searching on the internet for a CG tutorial in your program of preference.