This book covers it all. Learn the secrets of the Rosicrucians... excellent descriptions of the different planes, including subplanes in great detail, gives a very good description of the Rosicrucian view of the multi-dimensional existence, and the human spirit. Most of my beliefs are Rosicrucian. I have this book in print, but recently found it online in e-book format in its entirety. I appologize if this was posted before (I didnt see it)
http://www.rosicrucian.com/rcc/rcceng00.htm