Another benefit of subdividing for homeowners who would like to liquidate some of their real estate without having to sell the farm (literally), is that they may be able to both cash in on a portion of vacant land and stay put on the rest. Holding onto some of their land can give that property time to increase in value as the surrounding subdivided land becomes developed.
FindMyRoof does a pretty decent job of putting together a nice listing that gives all the basic details in an easy-to-follow format. It's not a terribly complex process to create a listing, and the site doesn't draw in a huge amount of traffic – but it is a relatively targeted audience of real estate buyers, which may make the site worth your time and consideration.
After identifying your likely buyers, try to think like them so you can focus your message to convey what they need to know about your property. Have information ready about schools, shopping and other nearby amenities. For developable land you can be prepared with zoning information and insight from local authorities about the location and capacity of water and sewer service. Each property is different, so customize your information for your situation and your targeted buyers.