File your initial pleadings, along with two full sets of copies, with the Family Law Business Office. The copies will be file-stamped and returned.Download and print child support forms, including income declarations, referrals, balance disputes, and others. These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County. Call to speak to our intake team, Monday through Friday 9 am – 5 pm. This comprehensive guide, spanning over 500 words, will walk you through the essential steps of filing for divorce in San Diego. How to File Divorce Petition San Diego. What is Required to Obtain a Court Date for your Custody Case? Key Forms Required in San Diego Divorce Cases. If you have children, you will also need to file a Declaration Under Uniform Child Custody Jurisdiction Enforcement Act (FL-105).