The one technique for how to sell a piece of land that is the same for home sales is using imagery to help buyers get a feel for the property and to help them get a sense of what they can do with it. For example, when you’re selling a home, you want to include plenty of photos with the listing and hold open houses so people can get a feel for the house. You want to clear out clutter and stage your home so buyers can visualize themselves living there, without being distracted by photos of your kids.
That means, as it always has, that you’re going to have to pay for your advertising just as sellers always have, but take heart in the fact that you don’t have to pay nearly as much for national advertising as you did in the days of paper. Better still, if you put a hit-counter on your web page(s), you’ll be able to keep track of how much traffic you get from each source. That will give you an idea of which ads are most effective.
You can also look to certain companies and organizations that have a concentration of people that may fall in the above mentioned roles such as investment companies (i.e. Charles Schwab, Fidelity), financial advising companies (i.e. Morgan Stanley, Merrill Lynch). There may be a higher concentration of people who can both afford and want to build their own custom homes or to build income-producing properties. Try linking yourself to financial advisors who may already know of people who have these types of dreams. This isn't a comprehensive answer of all the possibilities but just some thoughts. Good luck!