Appeal deadline questions after an unemployment denial after 13 years as a call-centre agent

I was told my separation was for misconduct, which is not what happened. There are 13 people counting on me, so I am trying to be careful. My employer's version of events does not match mine, and I have emails that show it. If you have appealed before, what helped you prepare?

Legal aid offices and some workforce centres help with unemployment hearings at no cost. A call is worth it.