Remote Access via modem through 2003 server to internet

I have a test 2003 server that I'd like to setup with a
modem, but I'm hitting a wall since I'm new (since
Tuesday) to the 2003 scene.

I've installed the OS, OS updates and the modem. I can
dial-in to the server just fine, but I'm unable to get out
to the internet.

Where is a "How to" that takes me step by step through the
setup?

and:

Do I need TWO NICs installed to get out to the internet?
That's the idea I'm getting from the KB here.

The server is connected to a cable modem that goes out to
the internet BTW.