You can check other sites like Ohioans for Concealed Carry (
www.ohioccw.org) If you register as a user, you will have access to their open carry discussion area. You can also read Ohio law and find that handguns, other than age of possession and concealability, are not really treated differently than rifles and shotguns.
If you OC your handgun, and keep it in a holster, and don't try to intimidate someone with it's presence, and are not under weapons disability, you should be legal. All that said, if a sheep calls 911 with a Man With A Gun complaint, you will get to meet a police officer or twelve. At that point, anything can happen. We have an idea of what SHOULD happen, but...
Ohio passed a firearm preemption law in 2007. This made it illegal for any political subdivision of Ohio to have any firarms rules regarding ownership, possession or carry, open or concealed. (Ohio Revised Code 9.68)
This means that only STATE and FEDERAL laws apply. It also means that a LOT of smaller cities and towns had to get rid of their own laws. There are still quite a few areas where local law enforcement is not 'up to speed" on this, or they simply have bad information. There are police, gun store employees and even concealed carry instructors out there that are still telling people that open carry is illegal.
Read the posts on this site. Read those on OFCC. Read various sections of the ORC (codes.ohio.gov), such as 2923, 2917 and specifically 2921.29.
Once you know what parts of these sections are important to know, and why, you are ready to open carry.
And yes, get a voice recorder.