Denied unemployment, how do I appeal? - 4 months and counting

I got a denial letter last week saying I left my job voluntarily, but I was let go as a security officer. I have been trying to stay organised about it. I have not done a hearing before and I am nervous. If you have appealed before, what helped you prepare?

Stay calm and stick to facts. Mine lasted about thirty minutes and felt more like a conversation than a trial.