conf t
interface Serial0/0/1
description Link to world
bandwidth 512 !<your bandwidth used for routing protocols>
ip address 192.168.230.1 255.255.255.252 !<your IP address other side would be .2 with this mask>
no shut
do the same on the other side... and up we go.
then you need to either put in the routes or run EIGRP or another dynamic routing protocol
ie
ip route 0.0.0.0 0.0.0.0 serial0/0/1