You just need a bill of sale, copy of prior owner's registration, and evidence sales tax has been paid for boat price on bill of sale. You can do the sales tax easily on line. You also need a pencil rubbing of boat vin numbers usually found on starboard rear corner. If an older boat that doesnt have vin number you need environmental police to come inspect boat and assign a number, Take all 4 documents to environmental police with the title and registration application, which you can also get on line. The EP folks are much easier to work with than auto registry folks. Good luck.