IP which is installed by default
since you won't have a DHCP server, they will both APIPA (a way of getting an IP address automagically) to the 169.xxx.xxx.xxx subnet, so you don't need to worry about that
you will probably want to turn off simple file sharing, if you leave it on, it makes things a bit trickier
are you wanting to map a drive/share files or share a printer or what?