How to Become a Used Car Dealer in Florida Becoming a used car dealer presents a wealth of opportunity for a small business. This opportunity can give an individual the independence to sell cars a source of income. According to the National Independent Automobile Dealers Association. in Public bookmarkswith car_salesused_car_dealerused_car_dealers_license Note: Becoming a used car dealer presents a wealth of opportunity for a small business. This opportunity can give an individual the independence to sell cars a source of income. According to the National Independent Automobile Dealers Association.