Taxes are such a finicky subject! D:
To my knowledge, because you are in Ohio you would charge Ohio taxes. And if my google-fu is correct that means you charge taxes to Ohio citizens (all based on zipcode) and everyone else would be tax exempt.
Honestly, though, if you're unsure about taxes you should definitely speak to a local tax authority. They'd be the best people to help give you a proper answer. I'd hate to give you wrong info on such an important subject