Most appeals from a trial court's decision are commenced by filing a "notice of appeal" with the trial court and serving a copy of the notice on the other parties.  The deadline for filing a notice of appeal varies depending on the type of case you are appealing.  What court your appeal will go to also varies depending on the type of case.  The pages linked below list some of the most common types of cases, how the appeal is commenced, and what court will consider your appeal.