Where do i get an estate adminstrator certificate?

You get a certificate of administration from the probate judge. Usually the judge just gives you permission to get one. You actually get it from an office. You will need that and a death certificate. You will need one to sell each piece of property or close each account, etc. The judge will check the will and assign you as executor. If there is no will then the Judge will appoint an administrator. That can cause more problems if there is much of an estate. If there is just a couple and all they own except for a car is in their joint names, no problem usually exists.