I have the exact same setup at home man. ok the nic that goes to the cable modem leave as DHCP dont do anything just plug on end of that cable into the nic card and the other end into the cable modem.the other nic card you need to assign it an ip (192.168.0.1) I suggest, that the other pc's on your network go up from there (192.168.0.x) and all get a 255.255.255.0 subnet
install the at home client on the other pc's and the at home server on the pc that has the 2 nics and is connected to the cable modem and off you go
no other setup is nessasary for anything (icq,explorer.etc etc)