Make a web page or use e-mail. Visit or telephone each prospective customer regularly. Hand write or send a personal greeting card. Write a technical article for a trade journal or publication. Make personal presentations at trade or industry shows.
Place leaflets on car windshields or home door knobs.
Put notices on supermarket and mall bulletin boards. Have booths at community affairs. The first point is to clearly define the product that you plan to market. Next, investigate if the product will sell and determine how much of it will sell. Lastly, the people or groups who will purchase your product must be clearly identified.