Check out the United Federation of Doll Clubs which is a large group of regional clubs. Collector's clubs can offer a wealth of information. To identify your dolls you can research in several books including:
"The Blue Book of Dolls and Values" by Jan Foulke
"200 Years of Dolls Identification and Price Guide" by Dawn Herlocher
"The Collectors Encyclopedia of Dolls" by Dorothy S. Coleman
Remember that older books will not reflect current values but can be a great source of information. If you can't find your doll in one book, try several. You can find these books used online. There are also doll magazines including "Antique Doll Collector" and "Doll News." You may find help in a Facebook doll group as well.