Create a website. In order to work as an affiliate marketer, you'll need your own platform (a personal website or blog) on which to post links and advertise for your chosen products or services. If you already have a website or blog, you can use that platform to begin earning additional income as an affiliate marketer. If you do not yet have a website or blog, you will need to create one.
The problem with affiliate marketing, like many other home business options, are the so-called gurus and get-rich-quick programs that suggest affiliate marketing can be done fast and with little effort. Odds are you've read claims of affiliate marketing programs that say you can make hundreds of thousands of dollars a month doing almost nothing ("Three clicks to rich!"). Or, they suggest you can set up your affiliate site, and then forget it, except to check your bank deposits.