Help with creating a membership based website in JOOMLA

I need someone who knows the joomla database structure very well in order to make a customized application that can work within the joomla environment. This application will : use the joomla registration process put the new user in one of two category : buyers or sellers handle payments after registration, the application will check the database for people of the opposite category in the same region. If there is availability in that region, it will return the results. If not, it will say that there is nobody available in that region at the time but we're working to find someone right now. if there is somebody available in that region, it will tell user that they have been paired and that admin will contact both parties shortly. So i need somewhere, either in a new table for the app or whatever, a place to store if they are buyers or sellers, a place to say if they are paired or not, and a place to archive what users the user has been paired with in the past. This will be an ongoing project, but this is the scope of the first part. ## Deliverables * * *This broadcast message was sent to all bidders on Sunday Jul 25, 2010 11:43:23 AM: You guys are bidding way to high. I changed the scope of this project, Please review and resubmit.