What legal paper do I need to fill out in order to be named Personal Representative on my father's on-going asbestos claim with a law firm?

Question Details: What legal paper do I need to fill out for probate? My father died last year and has an on-going asbestos claim. I am named "personal representative". I need a legal paper for the law firm (in the state where the suit is being handled). In order to handle this for my deceased father and my living, 90 year old mother. Do I file a "Voluntary Probate Appointment" or do I have to file something else, and if so what?

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