You can attempt to sell anything you like but you still need traffic. Who is going to come to your site and how is anyone going to know your site exists? It's not so much a mater of finding a product to sell on the net, it's more a matter of SEO, search engine optimisation.
The best earners on the net are search engines, portals such as yahoo, and media companies. How is yahoo successful? By traffic.
You get a few million hits on your site everyday and you'll make money.
Where do peole go when looking for products? To some one they trust, not to an obscure website that has been going for one week. You need to make a name for yourself, ebay for example. It's not easy and you're not thinking about this the right way.
Take a look at the bottom of this page, you'll see yahoo's privacy policy. Read it carefully, follow all the links and you'll see how yahoo makes money.