It seems like I'm lacking a lot of the necessary documents. Can I call you back by phone once I have them?
Of course. You can call the Office of Vehicle Safety and Clean Air at 1-518-474-4653 to get the forms, or call 1-518-474-0919 to get more information.
Allow me one final question though. What exactly should I do in which order to become a retail dealer with a DMV license?
To register as a retail dealer licensed by the Department of Motor Vehicles in New York State you should consult the DMV Commissioner's Regulations for Motor Vehicle Dealers and Transporters (CR-78) and download and read Facility Requirements - Dealers/Transporters.