A few books that might be useful are:
Nurturing Children and Youth: A Developmental Guidebook by Tracey L. Hurd (Boston: Unitarian Universalist Association, 2005)
Welcoming Children with Special Needs: A Guidebook for Faith Communities by Sally Patton (Boston: Unitarian Universalist Association, 2004)
Last Child in the Woods: Saving Our Children from Nature-Deficit Disorder by Richard Louv (Chapel Hill, NC: Algonquin Books, 2005)
The World’s Religions (New York: HarperOne, 1991) or The Illustrated World’s Religions (San Francisco: HarperSanFrancisco, 1994), both by Huston Smith
Sacred Texts is a comprehensive online source for holy texts in English.
If you would like to have simple and inexpensive reference books on hand, look at a few series, such as the Complete Idiot’s Guides (Alpha Books, an imprint of Penguin Group, Inc.), the For Dummies guides, or the Teach Yourself guides (McGraw Hill).