There are many thousands of registered descendants of this Cody Family, and they have websites to contact for help with linking to your own Cody Family. They don't charge anything, and even have a Museum with archives and records that people can research for you. That would be a good place to ask questions and be sure that you are signed up for their mailing lists, too. If you are a direct descendant, it's also important to be registered for the records of future generations.
There are links to click on to get to genealogy questions somewhere on the pages, but you have to poke around on the pages. These are a couple for the Cody families related to "Buffalo Bill", although there are more sites for them, too. www.bbhc.org