Got a denial letter for unemployment, what now? - 5 months and counting

I got a denial letter last week saying I left my job voluntarily, but I was let go as a medical assistant. I have read a lot of threads here and could not find my exact situation. The letter lists a deadline and a hearing process, but it is hard to follow. If you have appealed before, what helped you prepare?

I printed my emails in order and wrote a one-page timeline. The hearing officer kept going back to it.

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