Check with the court in which you will be filing your petition. Many courts have packages of forms with instructions for such proceedings as a name change. I didn't see any official court forms online.

When reviewing a name change petition for a minor the courts perform a best interest analysis, set forth in Mazzone v. Miles, 532 SE 2d 890 (2000). I would not normally expect a problem convincing a court to authorize a name change where both parents agree. (Exceptions could arise, picking an extreme example of a poor name choice.)