I like the suggestion to send out neighbor letters to the surrounding property owners. That is a great way to get the word out that you are selling your land. When I went to sell my land, I made sure to tell my neighbors or post of social media and every other platform in order to allow more people to see that my lot was for sale. I ended up way over my original price and with a good buyer that built his family a home there.
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.
I've seen a number of properties that are virtually useless due to their size and shape. I remember on one occasion, I came across a parcel of land that was 5 feet wide and 900 feet long. I've also seen properties that were 10 feet by 10 feet. If you see a parcel of land with an odd shape, use your common sense. If you can't think of a legitimate use for a property with its given dimensions – you'll probably want to think twice before buying it.
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.