Other then the basics of what species and what care requirements you can meet, here are some things that may further help you in your new adventure.
Before i give you a list of books, here is my warning.
Chameleons are addicting!

i Got my first less then a month ago and i've just invested alot of money into building a large enclosure to breed chams in.
Would i recommend jumping in as quickly as i did ( in the sense that i've already begun to plan on bigger ventures such as breeding )? no. do plenty of research first, i spent atleast 3 months researching them and still am every day and every night.just make sure you know what your getting into and you'll be fine, more importantly, your experience with chameleons will be a positive on on all sides!!
Here is a list of books that i purchased when getting our first chameleon!
I'll put a

next to the ones i highly recommend.
Essential Care of Chameleons
By: Philippe de Vosjoli
The Chameleon Handbook


By: Francois Le Berre ( I got mine at Petsmart!)
(don't buy a chameleon without reading this in my opinion)
The Guide to Owning a Chameleon
By: W. Schmidt, K. Tamm & E. Wallikeqitz
(older book but still found it interesting, Unnecessary however)
The Guide to Owning Chameleon Species
By: W. Schmidt, K. Tamm & E. Wallikeqitz
( Same time frame as book above, Interesting but unnecessary)
If your serious about getting a Chameleon Please, Please, Please Get "The Chameleon Handbook
By: Francois Le Berre, I would have been lost without it.
Hopefully this will help you in some way! Good luck and Hope to hear from you further on these fourms.
Feel free to contact me if there is anything you think i may be able to help with, yes i'm newer to the chameleon world but i have alot of experience in the animal world and will try to help you out the best i can!
Good luck!