On the machine you use for this setup, you need to have installed a Linux/*BSD with a working Apache (1 or 2) with mod_php4.
You need to checkout the www module from our SVN, it's located in /trunk. The www module will be the documentroot of your apache, therefor keep care that the apache process can read this dir.
You need to setup a vHost for the staging, here an example to have some vHost for your localhost running on port 8080.
Listen 8080 <VirtualHost 127.0.0.1:8080>
DocumentRoot <path_to_www> ErrorDocument 404 /media/404.php