The library has a fine selection of marine fishkeeping books. You will probably also want to visit your local bookstore because having at least one or two guides of your own is definately a plus for those emergencies or when you want to pick out fish.
Marine fish are 1) delicate, 2) 99% wild caught and 3) expensive. The best advice anybody can give you is to REASERCH RESEARCH RESEARCH! I like books, some people like websites, others aquarium clubs. Never take what your LFS tells you as writ in stone because the marine hobby is always changing and developing, lots of myths abound.
~~Colesea