cisco 1720 reconfig

Hi, we just aquired a FatPipe Warp aggregator.  I'm working on getting our one unused T1 onto an abandoned Cisco 1720 device.

here is the old config, i am wondering if it will be easier to modify the current config or just clear the router and start over if it can walk me through config'n it.  the ip's in here are no longer used.

i am pasting my 'show config', the only way into the device at the moment is through hyperterm.

Building configuration...                        

Using 883 out of 29688 bytes
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname kccrouter2
!
logging rate-limit console 10 except errors
enable secret 5 $1$lvaH$lGHLmdVOvEof10Vu/1F0X1
enable password kcctech
!
memory-size iomem 20
ip subnet-zero
no ip routing
!
!
no ip finger
!
ip audit notify log
ip audit po max-events 100

no ip dhcp-client network-discovery
!
!
!
!
!
!
interface Ethernet0
 ip address 192.168.3.1 255.255.255.0
 no ip route-cache
 half-duplex
 no cdp enable
!
interface FastEthernet0
 no ip address
 no ip route-cache
 shutdown
 speed auto
 no cdp enable
!
interface Serial0
 no ip address
 no ip route-cache

!
interface Serial0
 no ip address
 no ip route-cache
 shutdown
 no cdp enable
!
ip classless
no ip http server
!
!
!
!
line con 0
 transport input none
line aux 0
line vty 0 4
 password kcctech
 login
!
no scheduler allocate
end




//////
thanks,
matt