NEW YORK (MainStreet)We are still in the covered wagon, Wild West frontier days of making money off the Internet. New ideas, applications, and platforms are springing up almost weekly. If you are looking to cash-in on the Internet, first find a niche then sell to it. Sports is not a niche. Women in Southern California that play tennis left-handed that's a niche. The trick is finding a target market that is small, but not so obscure that only you and a few neighbors on your block know about it. The key consideration is: small enough to specialize, but large enough to monetize. Now that you've got your niche, here's how to make money off it.