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The BodyTalk System book is a great place to get you started understanding BodyTalk and how it works. In addition to providing a great overview of BodyTalk, several techniques are explained that you can learn to use for yourself. The author and creator of the BodyTalk system is John Veltheim, who is also a chiropractor, acupuncturist, and Reiki master. He combines many different philosophies and holistic techniques into a comprehensive system of bio-energetic testing to determine what the body wants done and in what order, and energy work to bring those changes about, in the truest sense of "holistic health". I believe this is probably the most comprehensive holistic healing system available and it is extremely powerful, especially in the hands of a practitioner trained in all aspects of BodyTalk.
If you're already proficient with energy testing and familiar with Donna Eden's Energy Medicine techniques, this book alone provides amazing additions to your "tool box" with the handful of powerful techniques described. I have been successful using my own energy testing methods, rather than the ones Veltheim suggests, so use what you're comfortable with.
You can link to the International BodyTalk Association website here, where you can watch videos for more information, locate a class near you, or locate a certified practitioner.