If you are the sole executor and the probate court has already vested you with the general authority to handle the estate, you can proceed to sale the estate at values you see fit.  However, if you are concerned about family backlash from your brother, then seek a temporary order from the probate court which gives you specific direction and authority to sell everything and at what price (or price range).  It usually helps if you have a realtor come in and assist.  They can usually help calibrate the parties on what is a fair listing price.  If the amount is challenged later, then the realtor will be your witness that the sale price was reasonable.  For the contents of the house, you can reach out to a service to host the estate sale for you.  Again, the advantage is that they are presumed to know fair market values, which will give you some high cover later if anyone challenges the sale values later.