How do i configure NAT in Win2k?

I have my internet connection to the router. I have a Win2K server with two NICs, the first NIC is connected to the switch where the router and public servers are located. The second NIC is connected to private network. I requested 30 IP addresses from my ISP. Some of which will be used by the public servers and the rest is for NAT.

My question is, in my Win2K server how do i configure the NAT in which i can use the remaining IP addresses for pooling. I read an article here using NAT but only using one address.

What is the significance in only using one IP addresses vs. a pool of IP addresses?
I can do this in the router but my boss wanted it this way. Pls. help me, thank you very much.