Need some more details but in theory if your printer is network enabled you just need to give it a name and enable sharing (Put it in the directory if you have the option). Control Panel - Printers R-click your printer and select the sharing tab.
You need to list your network setup, do you use a domain setup or a workgroup? What network equipment do you have for ethernet connections, is the printer a network ready printer, do you have a server, how many people will use the printer at one time, do you have security rights already known?
You left out a ton of details that are needed before you can begin to share a printer.