How do I advertise a product on the internet and sell it?

Look up advertising a product on the internet in a search engine

What an advice! Come on... let me share something, if you really want to sell, and you don't want to spend for advertising at Google or Yahoo, you can start by establishing web presence via forums ;)

Hi,
Check out http://www.ebay.com
You can read all about the selling part, how to use "power" words, etc. That would be a good place to start.

What is it that you want to advertise, perhaps I can help you.