Ecommerce from Inside

To make money online you may choose one of the next ways:

Writers
If you know how to write, you can try to write for some e-zines
or bloggers, but be ready to get $100 at most for article or post. Not my choice really.

Bloggers
Well, this is closer to making money, cause you can start your own blog, write about stuff and eventually get visitors. Who generate traffic which may convert to money if you place ads on your blog.

Ad Publishers
If you have a blog or site, you would like to get extra money from placing ads. That is easy to do and the best here is that you don't have to do anything with ad. Your main goal is to get as much visitors as possible and if they are in the right place, then they will be interested in clicking your ad. As a result you get paid. Lots of people made living on advertising.

Affiliates
Referral fees are a common practice in business. Same goes for online business. Vendors set the referral fees they're willing to pay as well as conditions for what. When the transaction happens, you get paid. Here you can earn more from single deal than in simple ad publishing, but to make real deal is more difficult than just let people click.

Affiliate Networks
Also known as associate networks. They let merchants to offer publishers a share of any revenue that is generated by the merchant from visitors to the publisher's site. The majority of merchant programs have a revenue share model, as opposed to a fee-per-action model.
Put simply, affiliate network is place where affiliates browse various advertising programs and try to promote them to people. People who follow ad and fulfill ad program's conditions are called leads who converted. And affiliates will be paid for those leads.

These were the most classic opportunities in ecommerce. It is good idea to find out more about all this stuff at least in basics before deciding what actually to do to start making money. Even if it seems boring as bat shit.