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If a property doesn't pass this test, you could have a very difficult time building any type of dwelling on the property, so unless you're able to tap into the municipal sewer system (which will negate this issue altogether), be sure to give the county health department a call and ask them what is required to install a septic system (or connect to the local sewer) in your area. For a detailed overview of how a perc test works and how to verify the status of this issue, check out this blog post.
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.