I need some direction on where to go and look for information on how to build a site somewhat like eBay. Here's a description of what I am looking for:
People can sign in and sell an item for a set price for a small initial fee - no final value fee.
NOT Auction based - although people can make an offer on something for lower than the price it's listed for..

Features I'd need to figure out:
Sign in/register,
How to get money from them
Search feature - searchable only certain categories also...

And maybe if it's possible to do it with Joomla or Drupal what extensions I would need. I know a lot in xhtml and css but not php, so... the site I want to make is going to be quite a learning experience for me. Any help is appreciated, thanks!