Open /etc/network/interfaces in ur favorite editor and u can setup interfaces from there. Now pass the commands:
sudo /etc/init.d/networking restart
sudo ifup eth0
sudo ifup eth1
Now restart the computer.
More directly, about your interfaces and “What is a simple way of configuring this?” – Rechil’s answer will help you “bring them up”, but you can specify which interface gets what IP address with the IFCONFIG command. With this, you can statically assign the IP address you want to the interface you want it on…