The best way to arrive at an asking price it to find three Realtors to do a market analysis for you. There is much more involved in a market analysis that just punching in the square footage, acreage, age of home, bedrooms, bathrooms and then seeing what the data tells you. This is especially true for rural property, as none of them are "cookie cutter". You will want someone to look at land use and zoning, the neighborhood, the overall condition and age of your well, septic, roof, building, etc. Is your property zoned for agriculture? There are too many variables in determining the price, and in this market it is the single biggest factor.
Once you have the market analyses done, you will be able to meet with these Realtors and get a feel for the way they work, and decide whether you want to work with them or not. One way to make sure you are getting the best available Realtors is to get a referral from a neutral party. If you like I would be happy to find you three great Realtors to choose from. Feel free to email me at firstname.lastname@example.org and we can chat about what your needs and goals are, and what you look for in a person to represent your interests.