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‌You should check with your state and country to determine what documents may be required, as they can vary by state. For example, some states will need you to provide Affidavits of Financial Means or Confidential Information Sheets. But the most common documents are:
Dissolution of Marriage Petition
Settlement Agreement
Parenting Plan (if you have children)
Court cover sheet if needed
Summons to be served on your spouse (petitioner serves the respondent who has a certain number of days to respond, or a default judgment may be given)
Read our article on the forms you need to file for divorce for more information.