The best thing would contact a realtor and have her to go out and look at the property, make sure most of it is not in floodplain, or 90 % is steep. , check to see if any utilities are available ( example water and electric there is no city sewer in this area. , and if it has a entrance road from a main highway.
HI, I would contact a Realtor in your area who knows your market extremely well. He or she will come out free of charge and give you a price that you think you can sell it for. Other than that, you could contact an appraiser, however, you will be charged a fee of a few hundred dollars. Good luck!