These are a few of the "must have" reference materials:

*MOON MAGIC by D.J. Conway
*CUNNINGHAM'S ENCYCLOPEDIA OF MAGICAL HERBS, by Scott Cunningham
*CUNNINGHAM'S ENCYCLOPEDIA OF CRYSTALS & GEMS, by Scott Cunningham
*THE WITCHES BIBLE COMPLETE by the Farrars
*SPIRAL DANCE by Starhawk
*MODERN MAGICK by Donald Michael Craig

This is just the tip of the iceberg! But these will be forever useful and get you on a path of building a sturdy foundation for further deeper studies.

Blessed Be!
Lady Mimi