Well, are you looking for an ip address for the internet? If so, contact an ISP. If you're looking to assign a private ip address to your internal network card, here are my suggestions:
On your network, use the following subnets to ensure security and your greatest weapon against the internet threat:
10.x.x.x (255.255.255.0)
192.168.x.x (255.255.0.0)
172.32.16.x (255.255.240.0)
Make your ip addresses unique (yet match) on the network... there's all kinds of info about this, even at search.com... you should find something.. called SUBNETTING
Otherwise, for some more basic possibilities, install TCP/IP first.