It helps if you already use the Internet for your own shopping.
Then you already have a knowledge about how on-line sales work and how easy it can be.
Familiarize yourself with a few companies that you like and think of as many reasons as you can as to why people shop on their computers.
To list just a few: comparison shopping is easy and fast.
You can compare both prices and selection.
Save lots of time driving from store to store looking for a particular item.
All this from the comfort of your home! Most big companies provide affiliate marketing opportunities.
I will use Amazon and eBay as examples.
Quite simply, they pay commission to individuals like you and me when people whom you refer, buy products from them.
It is to their best interest to generate as much traffic as possible to their websites and you can help them to it.
These are products people would buy anyway so you are not put in the position of actually selling.
Companies like Amazon and eBay have links on their websites that are labeled Affiliates.
When you click on that, you will be led through a series of steps on how to register as an affiliate marketer.
Then your goal should be to get the word out to people that you have this "service" available.
You can set up a link on your emails.
You can use social networking, blogging or similar methods to promote your service.
These sites provide widgets and banners to place on your blogs or websites.
You can send out press releases or write articles.
There are a myriad of ways to gather followers and shoppers.
Make sure you have set up a payment method with your chosen companies and you are well on your way!