The basics:
bridge irb
bridge 1 route ip
interface fa4
ip address dhcp
ip nat outside
no ip unreachable
interface bvi
ip address 10.0.0.1 255.255.255.0
ip nat outside
interface vlan1
no ip address
bridge-group 1
ip nat inside source list 1 interface fa4 overload
access-list 1 permit 10.0.0.0 0.0.0.255
Hope this helps, please rate post if it does!