Do I have a case for wrongful termination?

I am in OH. I was recently fired with zero warning and zero prior disciplinary action. When I asked if they had any further feedback for me, they literally said "nope" and that was the end of it. I was not hopeful that I had a case against them until the unemployment office gave their response to my former employer's attempted appeal of my unemployment benefits. Basically, the unemployment office determined it was an unlawful termination based on the fact that the employer could not prove that certain criteria were met. These criteria included the job description not matching the actual job, the duties changing after date of hire, and etc. The reason given by the former employer was that I could not perform the duties, hence they had to prove these criteria were met. What steps should I take? How do these cases usually go? Do I have a case? I can't afford a lawyer if I only have a small hope of winning, so are these typically "only pay if you win" types of cases?