Best Practice for Exchange install

What would be the best way to do this? I have one existing Exchange 2000 server. The server is not connected to the Inet for e-mail, only inhouse. We are going to setup a web server in house on a separate Windows 2000 server. What would be the best way to get SMTP setup for the Exchange server? The new server will have an Inside and outside interface behind a firewall. I would like the existing server to stay as far away from the internet as possible. What are my options?