Once the /etc/hosts.lpd is setup correctly, you just need to setup the client machines to print to the print servers lp queues. This just involves setting up the /etc/printcap on the client machines to point to the printserver. Once again, the easiest way to generate the printcap is to use `printtool`. An example printcap entry (stolen directly from the printing how-to):
# REMOTE djet500
lp:\
:sd=/var/spool/lpd/dj:\
:rm=machine.out.there.com:\
:rp=printername:\
:lp=/dev/null:\
:sh:
This just tells the client to print stuff to queue lp on the remote machine.