The buyer may want to pay to have a policy of title insurance issued on the property subject to the land contract. The buyer can hire a title agency to run a land record search and discover any potential interests attached to the property that may interfere with buyer obtaining a clean title from seller. The parties may agree to split this cost in the land contract agreement.
When you sell land by yourself, this is called a private sale. So, you will need to find a private buyer. It may help you to talk with local farmers if you are looking to sell raw land; farmers have all kinds of experience in purchasing land for their crops. If you are selling your land on your own without the aid of a real estate agent, this next section is for you.
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!