Setting Up The Servers

I've got 3 supermicro 1U servers with RAID 10 and 2003 Server Standard R2 and SQL 2005.

I've got a Netscreen 5GT firewall.

I've got Dotnetpanel

I've got the SmarterTools bundle

Whats the best way to set this up?

I put DNS, Email, Ticketing, Statistics and Dotnetpanel on Server #1

I put SQL 2005 on Server #2

I put the firewall in front with only 1 public IP

I've directed Port 80, 53, 21, 443 to Server #1 LAN IP

1. What do I do with server #3? How do I host websites with it if it doesn't have a public IP and port 80 is pointed at Server #1?

2. Is it common practice to connect web servers directly to the internet with a public address and no firewall or does everyone forward public ip's through a firewall?

3. I can tie everything into Active Directory;