3548P configure a network printer

Back again with a new question...

I recently inherited our network at a small college prep private boarding school.  The network was configured by an outside company many years before I arrived.  There is little documentation (that I know of), so I am flying a bit bind here.

I recently replaced an old 3348p with a 3548p, and got out IP phones and Internet working, but network printers are out.

I am assuming I need to configure the port(s) to which the printer(s) are connected -- any tips that will help a newbie?

Thanks

Tim