|A 16 port (minimum) switch, a good SOHO Router and an internet connection (assuming you want internet access). You'll want a 1000 Mbps (gigabit) switch and preferably 1000 Mbps network interfaces on all computers. The internet goes into the WAN side of the router, the switch connects to a LAN port on the router and all clients and printers etc will plug into the switch.|
You may possibly want to consider investing a bit of money into a file server so you can have one central computer to store all shared data on.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.