Just getting a 404 error

I've been following the installation instructions, but don't seem to be getting anywheer.

I've set everything up, added my first listing within admin and when I click the button to 'View Listing', I just get a 404 error:

http://theisleofavalon.com/listing/test-listing/

Another problem, is that it says when I go to my site, I'll see all the categories, but I don't see anything. As a part of this, I wouldn't want this on my home page, can it be in another section?