Can't tell you how glad I am that you are increasing your fish-keeping knowledge by reading books. It's the only way to stay afloat. During the past few months, I've purchased quite a few books. I have't found any to be a waste of money; they are all essential, in my opinion.
I will recommend the following: The Conscientious Marine Aquarist, The Saltwater Aquaruin Handbook, and definately The New Marine Aquarium published by MicroCosm. These books should and will guide you in the right direction.
Good Luck!