How do I get the computer on the network?

That is if the printer is network enabled and can have its own ip address (most mid to higher end lasers are).

If your just using a computer to host a shitty usb printer or something, then the computer that its plugged into needs to be powered on and on the same workgroup as you.

Whats the setup?

Either network printer, shitty usb printer with print server, or shitty usb printer attached to a host pc.