Let me count the ways. You can SELL others' products and services online. You can PROMOTE others' products and services online. You can WORK FOR SOMEONE online. You can SELL YOUR OWN products or services online.
if you can write content join squidoo, hub pages create lens for your self and put affiliate links which redirects user to landing page, you will get $$ for that conversion using affiliate marketing. you need to promote those lens then it could be possible. Thanks!
you can google the info you want to can search in ezine articles or read other people blog to get more info.you can also sign up for other peoples newsletter to read more about how to start online.