"For Dummies" books are often excellent for an overview of their subject and this is no exception. It gives you a very good idea of the variety of things you will need to know and do if you want to complete a children's book from idea through to publishing.
There are 6 sections: (1) The Market--kinds of children's books and their audiences; (2) the Writing Process--getting ideas, getting organized; (3) Story, character, dialogue, setting - how to create them; (4) Editing, illustrating and formatting your manuscript; (5) Getting it published and marketing, inc. social media; (6)Lists of resources, storyilnes, recommended children's books. All of these are good for an overview when you're beginning; some of these are stronger than others to actually -depend- on them while you're "in progress".
Section 1--this is a good overview of the kinds of children's booka, genres and the markets. This would be especially good to read before beginning to write anything. However, if you are already in progress, it will also help. The thing I liked best about this section was the interviews with people in the business--the President of Penguin Books, a small press publisher, a book buyer for Daedalus, a best-selling author. There are good sections about reviewers, what librarians are looking for, what parents like and what kids want.
Section 2- getting yourself organized as a writer--finding time, a place, organizing your work and research, getting ideas and working through writer's block.
Section 3 - the actual story. For me, this is the most important part of the book because nothing else matters if you can't tell a story well. I think there's lots in here that would strengthen plot/characters/dialogue if one reads and follows it. It would be great, imo, to go through with a writer's group.
Section 4 - Editing and Formatting. How to submit something that looks professionally formatted. Also, proofreading and editing--don't skip them because small mistakes can mark you as an amateur. Consider paying for an editor (how to choose one). An important Warning about the artwork.
Section 5 - Getting Published and Marketing. This is pretty ambitious as books are written about each of these. I don't think there's enough here to -really- help you get an agent or publisher, but its a good place to START. And has some useful "warnings" about good v. bad agents so you are not duped. '
I thought the section on Self Publishing was the weakest part of the book--unfortunate, because that's probably the route most writers will wind up taking. I would read it but go elsewhere for the "how to". (My recommendation: Start with Amazon's Createspace, especially if you do everything yourself but the physical publishing.) They have virtually nothing here about CreateSpace which is really unfortunate, since it is easiest and most effective for many people. I would read more elsewhere for this (Aaron Shepard's "POD for Profit", for example.)
Likewise, the "publicity" section is both too general and has many things that you will probably never be doing. It doesn't hurt to read them, but to actually market your book, you'll need something more in-depth. In one of the featured interviews, they have "The Only Book Marketing Plan You'll Ever Need"--a tantalizing title from the co-author of one of THIS book's authors--who did "Dummies for Fiction".
However, less it sound too self serving, their book debuted on Amazon at #1 in its topic and has held it since. So the philosophy shared here (which I haven't tried yet, but will) could be very helpful. He lists 6 easy things that will help (web site, blog, Facebook and Twitter buttons on the website, link to website in every book, launch a book with "RIGHT NOW" to followers and blog about it, and put your book on sale at your website. (Again, CreateSpace makes it ridiculously easy to do this--but this book doesn't mention it, which imo is a flaw, albeit a small one.) Again, for Search Engine Optimization, once you read what it is here, you should go elsewhere to find some expertise on how to use it.
Section 6 - Ten Things - sources of new ideas, children's book awards. Just a small fyi section.
There's an index--always a good idea, but not every book on writing has one. So...another plus. Overall, this will help you through almost every stage--except, imo, if you're ready to publish or market your book. For that, I'd get a specialized book. Otherwise, this is definitely recommended.