You buy a cheap switch that you can attach also to a router port for the internet. This switc will act as a LAN to the PCs and printer(s) connected to it.
You would let Control Panel/Printers discover your network printer and the driver will need to be installed on each PC on the LAN.
Sharing files is best dome by adding a NAS drive to one of the ports on the switch. It can then be seen by drivers you install on each PC.
Alternatively you can set any directory in PC to be shared across the LAN. Other PCs need to know the workgroup and PC name of everything else so that other PC users can access a directory in a different PC's hard disk.
The details of how to do all these steps can, of course, be Googled.
OK?
Suspishio
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