Well, I’m finally getting most of the initial stuff for the server up and running. All I can say is thank goodness for Google.
Setting up DHCP/NAT was both simple and highly complex. Simple in that running the Gateway Assistant from the NAT setup was easy. Complex in that the default /etc/bootpd.plist is missing some required information.
After some inspection of the log files and some Googling. I found that adding the following lines to /etc/bootpd.plist fixed the problem.
<key>net_address</key>
<string>192.168.1.0</string>
Thanks to the Apple Discussion Forums.