D.C.
If you were never married AZ law states that you are the legal guardian, untill a court states otherwise. You can establish custody at the same time as support, IF you go through the court. If your using DES to establish support, you'll need to file for custody seperatley though the courts. All the forms you'd need are available at www.superiorcourt.maricopa.gov. Go to the selfservice center, and look under Family court forms. You can do this yourself, and don't need an attorney, but if you have questions, there are refrences on the website for lawyers and paralegals available on the 6th floor of the court house, or you can go there and make an appt. It's not completly free, but not too expensive either.