Self-Publishing for Dummies by Jason R Rich is exactly what you’d expect, and what I really like about the “Dummies” line of books. They really aren’t written for dummies at all. But they don’t presume any previous knowledge of the subject, and explain all concepts and terms so everyone can understand them.
That said, Self-Publishing For Dummies isn’t going to be enough for you to get your Self-Publishing business off the ground. It’s enough of an overview to teach you what you *don’t* know, and point out some resources to fill in the gaps in your subject knowledge. There are different methods of self-publishing, just as there are many different methods of running your own business (and honestly, self-publishing is running your own business.) This book shows you much of what you are in for if you want to go the self-published route, but you’re going to need more specific texts and advice if you actually decide to go forward with self-publishing.
I’d recommend this book as the first (of many) books to read on the subject of Self Publishing.