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

I got a denial letter last week saying I left my job voluntarily, but I was let go as a janitorial supervisor. I have not done a hearing before and I am nervous. Did you bring documents or only talk?

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

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