Three pages of reply's and no one has said 'book'?
Quite often when you ask a question online you'll get a lot of wildly differing opinions from people that might know less than you do. Books offer well researched advice with references to back up their claims.
Building a Proper Marine Aquarium Library
by Pro, Steven
http://reefkeeping.com/issues/2008-01/tips/index.php
Remember to use the search engine too. I can almost guarantee that any question you have has already been asked and you'll find the answer by checking the older posts.