But pretty-much the only difference between the desktop and server versions is the absence of a desktop in the server version. Still, your call.
In the server version, the networking is set up in file /etc/network/interfaces. For a server, you probably want a static IP address. Here is an example configuration stanza for a static IP address:
# The main network interface
iface eth0 inet static
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 192.168.1.40 192.168.2.40