Hi Danielle – I presume you have a website or blog? If so, the easiest way to start is by signing up for an affiliate site, like Commission Junction. They represent hundreds of companies offering affiliate programs. But you can also contact companies directly, preferably those who’s products and services you actually use. Most company’s have affiliate programs now, so you can try signing up that way. They’ll give you a coded link to place on your site that will credit you for the sale when a reader clicks through to their site and makes a purchase.
Websites like Care.com connect parents with babysitters. The company does all the background checking and other due diligence to put parents' minds at ease. Of course, you can appeal directly to people in your personal network, but if you're looking to generate recurring revenue sign up with a site marketing to parents looking for child care services.