Items in bold are your specific settings.
IP Address and subnet mask
1. Global config mode
2. Go to your VLAN for the outside
3. ip address public ip netmask subnet mask
Setting the default gateway.
1. Global config mode
2. ip route outside 0.0.0.0 0.0.0.0 gateway IP address
No need to use DNS, but if you really want it
1. Global config mode
2. dns name-server dns server ip
3. dns domain-lookup interface
HTH