How are you planning to network them? If you've got a router which functions as a dhcp server (most do), all you should have to do is connect them to the router and you're good to go.
If you're trying to set up filesharing and the like, samba
is the way to go.
Since you ask about commands & software, is there some specific functionality of the rather general term "networking" that you're planning to set up? What exactly are you looking to do?