Collector Cars Wanted

Is there a certain limit of cars you can buy and sell a year in Ohio? I am just a car lover and I purchase different cars, keep them for awhile, then sell them to get something else. I looked on the OHIO DMV website and found nothing. Does anyone know a website that would disclose this info? Thanks.

• I want to start buying and selling used cars. I was wondering if anyone had experience or advice how?
• I want to make money buying and selling cars for profit, anyone have any ideas of how I should start?
• does anyone know of a good place to find used cars for sale?
• Is buying and selling cars a good business to get into?