Appeal deadline questions after an unemployment denial

I was told my separation was for misconduct, which is not what happened. Any experience at all would help. 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?

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

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