How do I know whether I have a good appeal?

Whether or not you have a good appeal or a good chance on appeal really depends on several things. It depends on the issue in which you're appealing from. It depends on whether or not you were the winner or loser in the lower court. It depends on your facts and it depends on what the law says. You should consult with an experienced appellate attorney, he or she can be able to go through your record and give you a better understanding of what chances you have on success for your appeal.