There is an expert on mantis shrimp over at reefcentral.com , think his name is gonodactylus. Really nice guy.
Check the mantis shrimp tab out and you can't miss him.
As far as breeding goes, it's very difficult and I'm not sure it can even be done in captivity with most species. There is a supplier of mantis shrimp out there that does sex them so you know what you are getting- think it's stomatopods.com (spelling)
Good luck