You will need a photocopy of the marriage certificate. If it is not in English, it will have to be translated. You may need your Naturalisation Certificate as proof of Nationality, depending on what ground you use to satisfy the jurisdiction requirements. See the Summary of documents you need to complete and file in the section "Filing - Step by Step" contained in Chapter 2 of the Family Court Practice Manual. The Divorce Kits also give details of what documents are needed.