Executing the RPM Development Environment build daemon is easy.

cd path/to/rpmde-daemon-1.0
chmod u+x rpmde_daemon.pl
./rpmde_daemon.pl 

The script will then detach itself from the shell and will be running in the background.  An immediate check is performed for any scheduled builds.  A quick 30 second wait is performed if nothing is found the first time.  Any other unsuccessful checks will result in a 5 minute wait before the next check.