Deceased mother, never married, I am her onl child, she has a house her only asset, do I have to open an estate. Don't have attorney fees.

Yes you have to open an estate.  If there is a will, you must probate the will.  Go to the county probate office in the county in which your mother lived.  Bring the will, a death certificate and a check.  By probating the will, you will be recognized as the person in charge of the estate.  You will be able to sell the house, or put the house into your own name.  If you are going to sell the house, you will need to open an Estate checking account, and will need to get an EIN for the estate.  You will use an online application at the IRS - form SS-4 - to get the EIN.  You will need the EIN to open the estate account.