Step 1: Determine your court and type of case. First, determine if you'll file in juvenile or domestic relations court.Fill in the name of the county where the action is. 2. Fill in the name of the Minor Child(ren) involved in this action. 3. You will need to file a petition with the Clerk of Court in your county. Legal experts explain Ohio child custody laws, including how custody works, the types of custody (joint v. Enter the Plaintiff's and Defendant's name as listed on the previous order. File all cases in the original Division. Application for Private Custody Evaluator Application List, Application for Private Custody Evaluation Appointment List After the forms are filled out and copied, go to the Juvenile court.