Appeal deadline questions after an unemployment denial, customer-service rep here

My claim was denied after 13 weeks of waiting, and the letter says I have a short window to appeal. There are 8 people counting on me, so I am trying to be careful. 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.