Practical Candle Burning by Raymond Buckland
First, if you have never done any sort of magic before, this book is an ideal introduction to the subject from a practical point of view. Second, although many people are involved in Pagan religions, many others are involved in Christianity. Most of the rituals in this book are presented in two ways, one for Pagans and one for Christians.
This book can really be used by just about anyone. Third, by practicing the techniques in this book, you'll learn the underpinnings of magic. In no time you'll be able to come up with your own rituals based on the ones listed.
When you can design your own rituals, and be successful with them, you will truly be a magician. And the place to start is with this book.