http://www.amazon.com/Talk-With-Dead-Alan-Valiant-ebook/dp/B00502AG98/ref=cm_cr_pr_product_top?ie=UTF8
This book is amazing. Took cues from some of Valiant's 72 Principles of Communication with the Spirit World for a stylized system of spirit communication using the tarot.
Highly recommend it for beginners, since divinatory communication is one of the foremost tools of the magickian who intends to work heavily with spirits or develop ever-practical spiritual diplomacy.