Got a denial letter for unemployment, what now? (Louisville)

I got a denial letter last week saying I left my job voluntarily, but I was let go as a bookkeeper. 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?

Thanks for writing this out. I went through something close to it 14 months ago, and it settled down once I kept a simple log of every call and form.