I am working on a site, I need some help. Please answer my questions

I am working on a site, I need some help. Please answer my questions.
Suggestions

Im looking at making an information gathering site which stores information in a database and displays it in a table, some of information about each item can be viewed by the public eg price, dateposted, type, though other information on the item like contact details, name, email address can only be viewed by paying customers. I would like the information to be viewed much like this site does it:

I have been working through tutorials and have managed to make a database with tables and then get the information from the mysql database and display it in a table using php in dreamweaver.(big step for me) This is the tutorial I used: http://www.pixeldigest.com/display_data.html

Though Im not quite sure this is what I want to be doing as all the sites I want to be like seem to have some form of xml.

Please answer the following questions :cowbell:

  1. Could someone explain how the connections work with these sites?

  2. Every time someone does a search is there a query on the database then an xml page is made for each custom search? Or does something on the server side indexing everything once every say 30 minutes and creates 1000’s of xml pages, meaning when you do a search you aren’t actually querying the database, you are just searching through the created xml pages?

  3. If my assumption is correct, what do you think is better? 1000s of users searching through xml pages? or 1000s of users querying the database? And why?

  4. Does anyone have any links to recommended tutorials?

  5. none of these questions make sense and I should give up now.

I am all :ear:s

Sweet! thanks heeps! I am right on it!:bounce: