Configure 1800 Router with ethernet connection

We no longer will be using our T1 connection we now have a dedicated
lan connecting to the web. I am new to Cisco routers. How do i
configure this Router with my settings.

Internet Provider gave me the following info and I am not sure how i
can configure it. So i am a bit confused.


Example......
External IP Address 10.1.111.34
Subnet 255.255.255.252
Gateway 10.1.111.33
DNS 127.0.0.1

Internal IP Address 10.1.55.161
Subnet 255.255.255.224


Thanks

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