I think it may be tough to find one "definitive" book or article on how to set up a cat, since there is such a huge diversity of beachcats.
Single sail, sloop, spin, daggars, etc. Most manufacturers probably post assembly, general tuning, and other information for their specific models which would be the best starting point.
As for sailing the cats, check the Catsailor store. I believe there are several books on catsailing worthy of your attention.