Usually you want to do a few things when selling land.
Clean And Prepare The Land
Mark The Boundaries - there is no requirement to do this but people are more likely to buy land when they know what area they are buying. Buyers doing a survey is common, i would recommend if you know the basic boundaries to leave it to the buyer, if you have no clear idea of beginnings and ends you should consider getting it done.
Market the property
If you can offer financing when you sell, do it. It is the single easiest way to add value, and get a better price. In fact, if you may be able to make money just buying lots, marking them up 25% and selling them on easy terms.