It would help if you posted what you have so far, however - I'm posting a sample config from 4 routers. Hope this helps.
Router1
interface f0/0
ip address 192.168.1.1 255.255.255.0
interface s0/0
ip address 172.16.1.1 255.255.255.252
router eigrp 1
network 192.168.1.0
network 172.16.1.0
no auto-summary
Router2
interface f0/0
ip address 192.168.2.1 255.255.255.0
interface s0/0
ip address 172.16.1.2 255.255.255.252
interface s0/1
ip address 172.16.2.1 255.255.255.252
router eigrp 1
network 192.168.2.0
network 172.16.1.0
network 172.16.2.0
no auto-summary
Router3
interface f0/0
ip address 192.168.3.1 255.255.255.0
interface s0/0
ip address 172.16.2.2 255.255.255.252
interface s0/1
ip address 172.16.3.1 255.255.255.252
router eigrp 1
network 192.168.3.0
network 172.16.2.0
network 172.16.3.0
no auto-summary
router bgp 2
no synchronization
bgp log-neighbor-changes
redistribute eigrp 1
neighbor 172.16.3.2 remote-as 2
no auto-summary
Router4
interface f0/0
ip address 192.168.4.1 255.255.255.0
interface s0/0
ip address 172.16.3.2 255.255.255.252
router bgp 2
no synchronization
bgp log-neighbor-changes
redistribute connected
neighbor 172.16.3.1 remote-as 2
no auto-summary
