Greetings,
First step is to download
RWeverything, and
change product numbers of Windows on each machine. You read the data from SLiC table record, and change it accordingly.
Second, You need to decide, whether You want a small network, or a domain.
If You want a small [home] network, simply get a router a switch, and connect all the computers into it, into switch. And connect router to the dedicated switch port for the router, or to the first one, or any, if switch has no dedicated. Now decide whether You want DHCP [router in our case] to assign iP adresses to Your machines, or You want static iP adresses, and set the computers network adapter accordingly. I recommend to have one machine as a server, or/at least one NAS for data in the network.