Hello, I created this book list for newcomers to the Western Mystery Tradition. This is not comprehensive and in no particular order, but these will give you a great solid understanding of what it is and how to work with it.
A Magical Education by John Michael Greer*
The Astral Body by A.E. Powell
The Etheric Double by A.E. Powell
"Transcendental Magic by Eliphas Levi
Sane Occultism (also titled What Is Occultism?) by Dion Fortune
The Cosmic Doctrine by Dion Fortune
Learning Ritual Magic by John Michael Greer
Circles of Power by John Michael Greer
The Kybalion by Three Initiates
The Practical Guide to _____ series by Melita Denning and Osborne Phillips**
Llewellyn's Complete Book of Ceremonial Magick: A Comprehensive Guide to the Western Mystery Tradition edited by Lon Milo Duquette and David Shoemaker***
The Magick of the Tarot by Denning and Phillips
An Introduction to the Study of the Tarot by Paul Foster Case****
The Tarot: A Key to the Wisdom of the Ages by Paul Foster Case
The Chicken Qabalah by Lon Milo Duquette
* Highly recommend this as a great start, especially for those that enjoy developing their own study plan.
** There are quite a few of these on various topics such as psychic self defense, astral projection, creative visualization, etc.
*** Seriously good resource packed full of information.
**** Paul Foster Case was an amazing occult scholar and any of his work on the tarot is highly recommended.