Colloquially, the terms voodoo and hoodoo are used interchangeably. Practitioners distinguish between the two -- Voodoo is a religion that might include magical practice, wheres hoodoo refers to magical practice alone and a person of any religion might use it. Properly, this list is an advisement of hoodoo studies -- but a novice who came looking for "voodoo" may indeed discover here what they came for.
Following the uses of herbs, you will need to learn how to use the patent formulas which abound in hoodoo instructional books. Some folks, unaccustomed to the practice of buying ready-made formulas, accuse hoodoo authors of just trying to "advertise their shops" with these sorts of spells -- as if completely unaware that multiple manufacturers produce these oils. When a cookbook says to use ketchup it doesn't mean the author is heir to the Heinz fortune, and when a magic book tells you to use a certain formula it is not because they're trying to rip off the reader. Golden Secrets of Mystic Oils (Revised edition)
Nevertheless, if buying ready-made formulas is not your style, you can easily learn to make the mixtures yourself. Be prepared to invest a bit in essential oils and herbs -- but take comfort, for this book does provide a list of substitutions for hard to find ingredients (or for those unhappy days where you just need it NOW and can't get to the shop.) The Conjure Cookbook: Making Magic with Oils, Incense, Powders and Baths
New Orleans style hoodoo tends to favor candle burning as a way of casting spells -- and with the world as it is today, where people who know each other don't always live close together, candle magic is almost a must. This is the book for learning such spells. Master Book of Candle Burning
Now with the basics covered, we can proceed to the real work. The following are favorite sourcebooks for spells and practices: