As stated, you can go to your start button and follow these easy steps:
Start--run. Type "cmd" and click "ok"
In the black screen type "ipconfig /all"
You can also accomplish this by right-clicking on My Network Places and going to "properties". Next scroll to Internet Protocol tcp/ip. Next click properties. If you have a static IP and DNS address, it will be shown there.
Because you are setting up a router, your ISP should provide or dictate these settings. For example, if you are setting up your Local Area Network, you typically configure the router for PPPoE, Automatic or Static. My router looks something like this:
Internet Setup Automatic - DHCP
Network Setup 192.168.2.1
Subnet Mask 255.255.255.0
DHCP Server Enable
Starting IP Add 192.168.2.100
Max. # of addresses 50
Leave DNS blank
Hope it works for you!