There are quite a few good aquarium books out there that will help you with everything that you need to start out. I always recommend buying at least one good aquarium book. It helps you with all the basics, and also gives you a referance that you can turn to when something has you stumped. They are also helpful if someone turns to you for answers. Here are a few good books, everyone feel free to add to this list:
A Practical Guide to Tropical Aquarium Fish, By: Richard Crow & Dave Keeley-this was my first aquarium book, and it's a very informative book with beautiful pictures
Exotic Aquarium Fishes, by: Dr. William t. Innes- an older book, but they keep making new editions and prinitng it, so it must be good!
Barrons has a wealth of amazing books, I don't know the names, but pick the one that suits you best. these books are very informative and VERY CHEAP, so they are a great option. That's really all I can think of right now, but I know there are more