where can I find a form for personal representative for an estate in Oklahoma

I'm sorry for your loss. Many lawyers who include probate in their practices would give you a free initial consultation.  More information is needed to help, Oklahoma hasn't adopted forms for Probate practice as situations can vary so much. Depending on how they were held or titled, sometimes houses and cars can pass without probate.  There are also some estates that qualify for a more simple procedure, I recommend that you call some lawyers.