This is a great book to start you off covering all the basics. It explains everything from the history, the equipment, techniques etc. Everything is based around basic obedience commands - but with a slight twist for how you need to use these things in agility, which is explained fully.
The book is split into very easy and logical sections, tackling each piece of equipment at a time. I found the steps very easy to follow and simply explained.
My only criticism is that it is a US book, would be great to have a UK version - but don't let this put you off buying it as the only section that this would affect would be a couple of pages near the beginning about the different Agility organisations and the American KC, which does not detract from the rest of the book.
A must buy for anyone wanting to start out/thinking of starting agility, I would highly recommend it.