All this first system needs to do is two things: Display a page to build a query into a real estate listing database. (Stuff like location, number of bedrooms, acreage, school district, etc.) Then display a page with the results. And, I guess, allow the display of more detailed information from the first results set. But as much as I've been through "the book" and all the documentation I can get my hands on I haven't seen anything that starts to tell me how to build queries and display results.
Or is that one of those things that should be intuitively obbvious to the most casual observer?