Glad to see you found a sailboat you like. All this other stuff must sound confusing. Take a look at this site for tons of Cape Dory research and conversation Cape Dory Boats - Index
Your boat info is listed under "About Cape Cory Boats". --Buying Flow chart is kinda like buying a house---. Besides the usual title & registration the boat may be a "Federally Documented" boat with the US Coast Guard. Info at USCG National Vessel Documentation Center, Home Page
Some people do the transfer themselves and others pay to have it done. All instructions are provided, I did it.