You need to file a document entitled Complaint for Legal Separation. You can most likely find the form on the internet if you do not want to hire an attorney.
You should consult with an experienced Arizona family law attorney, who can explain to you the process, as well as your rights and responsibilities. Here is a link to the Maricopa County self service page that has the information, forms and instructions for you to represent yourself in filing a petition for legal separation: https://www.superiorcourt.maricopa.gov/SuperiorCourt/Self-ServiceCenter/Forms/FamilyCourt/
The best place to start is to meet with a family law attorney for about an hour and get the information you need regarding your rights and obligations so you know how best to proceed.
You can meet with or hire an experience lawyer to represent you. You could also purchase a self help book or visit the self-help center at your local court house.
Your best bet it to hire a local attorney that deals in family law. Barring that, go to the court clerks' office. They might be able to offer guidance.
Contact the local self help center at the courthouse or the court filing clerks who usually have a nice informational packet on divorce cases, from the forms you are to file to the basic legal reasons for doing do. If you don't have such a facility try the internet or a consultation with local attorney. Good luck.
File the proper papers with the court. If you cannot afford an attorney to prepare the papers for you, then visit the self-help center at your local family law courthouse.
The best thing to do is to find a lawyer who specializes in family law. If you're going to do this on your own, go to your county courthouse and see if there is a facilitator who can steer you to the forms you need and the process you need to follow.
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