When deeds are drafted as a part of a land sale, they have to be recorded to become a matter of the public record and protect the buyer's ownership rights. It is customary for buyers to pay for the cost of recording -- after all, it's the buyer that benefits from having his interest in the property entered in the public record. However, this custom isn't always the case, and some areas assign the fee to the seller, or to both parties equally.
Just like any sale of real estate, a land contract should begin with a purchase agreement. This is a legal document signed by a potential buyer making an offer on the real property for sale. The purchase agreement should indicate that the offer is for a land contract, and should state the purchase price, initial cash down payment, length of the payment term, and any other terms of sale.
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!