UNIX printing is one of those black magic topics; those who understand it think it's straightforward, while those who have never worked with it cower in fear and hope it will just go away. Setting up a printer attached directly to an OpenBSD system can be very difficult. I strongly recommend that you investigate apsfilter (http://www.apsfilter.org/). This will help you install all necessary software and configure /etc/printcap for your printer.