I mostly use the only book written specifically about Mississippi tokens, called Brozenes and Doodlum - Private Money in Mississippi, by George P. Chatham. It was painstakingly researched, and has pencil drawings of almost every token that is listed. There have been quite a few new discoveries since it was written in 1990, so my copy has lots of additions written in.
I also use Tokencatalog.com. It accepts contributions from anyone who is registered, so it is possible that some of the entries have not been researched fully, but the listings are extensive. For example, it lists over 4600 tokens from Alabama. If you want to branch out further than just your home state, I and others can suggest some books on whichever area you might like to pursue. There are books that cover specialty areas like coal or lumber tokens, transportation and parking tokens, Hard Times, Civil War, U.S. Merchant, etc.
Ebay usually has lots of Alabama tokens for sale, and you can check sold listings to get an idea of current pricing. Also, I have found tokens at coins shops and shows, antique stores, flea markets, and auctions.
Thank you for the kind words, by the way. I appreciate them. And, I appreciate all of the posters who have contributed to the thread.