you want to know about Name change?
Yes
You cannot change the name on the vehicle registration or title certificate to someone else's name. You must transfer ownership of the vehicle.
and what if they suffer flood damage
You can check the National Insurance Crime Bureau's database to see if a vehicle is damaged by flooding. You will need the VIN vehicle identification number.
and what should the buyer of a vehicle do?
The buyer should   sign the bill of sale, even if it is a gift    pay sales tax or have proof of an exemption
and what advice can you give me to buy a vehicle?
Read DMV brochures, Inform Buyer and Questions and Answers about your certificate of title
and are Proof of Ownership necessary?
Do you know about All-Terrain Vehicles (ATVs)?. What about a new ATV's proof of ownership?
for new ATVs, you can use as acceptable proof of ownership the Manufacturer's Certificate of Origin (MCO) or the Manufacturer's Statement of Origin (MSO).