There are so many wonderful books very helpful in connecting with your Angels.  I've included some useful in exploring past lives and healing techniques as well. Any of Doreen's many books are very good but these are helpful for beginners.

ANGELS 101:  An Introduction to Connecting,
Working and Healing with The Angels
by Doreen Virtue

ANGEL MEDICINE
by Doreen Virtue

IN THE ARMS OF ANGELS
by Joan Wester Anderson

ANSWERS FROM THE ANGELS
by Terry Lynn Taylor

THE WHISPERS OF ANGELS
by Annette Smith

MANY LIVES, MANY MASTERS
by Brian Weiss

JOURNEY OF SOULS
by Michael Newton

A GIFT FOR HEALING
by Deborah Cowens

ANCIENT HEALING TECHNIQUES
by Douglas DeLong

ASTRAL TRAVEL FOR BEGINNERS
by Richard Webster