Take a look at this extensive reading list we have setup.
BTW for your convience there is a link to amazon.com for each book. If you can get it cheaper by all means go for it. We just link to amazon as the site gets a small % of each sale.
I would recommend at the very least the book Conscientious Marine Aquarist by Robert Fenner
and Aquarium Fish Magizine
. AFM is a monthly perotical with articles about saltwater topics each month. This magazine is not exclusive saltwater but they do have a fair amount of info on saltwater care each issue.