Applying for Child Support services is more convenient than ever when you apply online through the AZCARES Child Support Customer Portal! Forms and information for filing for child support in Arizona.Form: Petition to Establish Child Support: (1) Fill in the name, address, and phone number of the person filing the form. Some Child Support forms, documents and applications found in the Document Center may need to be notarized. Instructions: How to Fill Out the Forms for Establishing Child Support, DRES10I ; What to Do After Completing All Forms to Establishing Child Support, DRES10P. Fill in the full name and birth date of all minor children who are the subject of this "Child Support Order. " (Use extra pages if necessary). In this blog post, we'll provide a step-by-step guide on how to file for child support in Arizona. Include your case number in order to self-populate the forms. Petition to Establish Child Support (Table of Forms).