Where can I find the rules that govern appeal?

Every court system has their own rules that govern appeals. For example, in Florida State Courts, those rules are found in the Florida Rules of Appellate Procedure. In the federal system, they're found in the Federal Rules of Appellate Procedure. These rules can be found in book form but now many times they can be found online. An experienced Appellate Attorney would be able to explain the rules in your court system.