Bodhi and Sunyata capture the essence of tantra in this easy-to-read workbook. Whether you're an advanced tantrika or a beginner doing preliminary research, you will gain great insights through reading this material and following the exercises. The book trains you in the fundamental techniques of tantra that grant you access to your spiritual and creative potential by using your sexual energy, and teaches you how to overcome obstacles you may run into on your way. It's a 'must read' for anyone on this path.
For those without a partner, there are some useful exercises such as the Rishi Isometrics and other breathing exercises. I would recommend learning the MentalPhysics Exercises taught by Edwin Dingle however. This book does contain a more effective form of the 5 Tibetan Rites of Rejuvenation that is very popular. Additional techniques are given to make the exercise more effective. Stephon Co's latest book also modifies the 5 Tibetans and makes it easier for the elderly and the infirm. If you're on the Tantric path you could also look into the other comapnion book, The Ipsalue Formula by Bodhi Avinasha. Kriya Tantra Yoga is supposed to be from Babaji Maharaj who gave it to Lahiri Mahasaya who gave it to Sri Mukteswar. Don't know if this is the case or if they ever even spearated White and Black Tantra. Tantra can be the way to enlightenment but most of the stuff out there is contaminated so it's hard to be a purist. Safer to stick with genuine Kriya Yoga for attaining your spiritual goals. For your other needs, check out the One Minute Guide to Prosperity by Sri Siva and Power Healing by Dr. Sha both of whom have web sites for more info.