Affiliate marketing is a great thing to get into if you want to quit your job and start doing something that has a lot of opportunity.
The way the affiliate business works is you sign up to an affiliate program or network like Clickbank. Then you start promoting the product for the merchant.
You get an affiliate link that you put on your website. That way whenever someone clicks through your affiliate link and buys the product you make a cut of that sale.
Then your account for the affiliate program gets credited and you get paid. This is a great way to make money online.