If you're just connecting to the Internet and you only have 1 router in your whole organization then all you really need to do is
1) Put an IP address on the ethernet port. 'ip address 100.100.100.1 255.255.255.0'
2) Put the IP address assigned to you by the ISP on your serial port. 'ip address 1.2.3.4 255.255.255.252'
3) 'ip route 0.0.0.0 0.0.0.0 serial0' or whatever the name is for that serial port
4) Add the IP address of the ethernet port on the router as the gateway on all your PCs Tom Bilan
TJBA, Inc.
CCNP, CCDA, MCSE, CNE, CCA, ASE