I'd love to learn to drive but can't afford another horse to start with. Are their schools where you can take driving lessons, much like riding lessons, with school horses? Do you know of any in OH or have a website that has cataloged them?
I've run across a website out of Montana, that is a carriage driving school. That's the only one I've seen, although I haven't been looking specifically for the driving school. If you're in OH, there must be Amish or Menonite communities within reasonable driving distance. Maybe someone in those communities would be willing to teach you to drive for a reasonable rate. That's where I would turn first. Good luck.