No matter how small your business, you still need to go through all of the proper licensing procedures. If you can operate under the cottage food law, you wouldn’t need a permit from the ag dept, but you may need other permits. http://forrager.com/faq/#starting
Chocolate should be allowed under Ohio’s cottage food law. The only thing that could be a problem is that you may not be able to sell to a business. You’re supposed to be selling to the final consumer, and that individual would be informed that your products are homemade via your label. Obviously a business card would have the intention of being consumed by someone else, and that may mean that you need to use a commercial kitchen. http://forrager.com/faq/#commercial
You should call the ag dept for a definite answer to your question.