After careful study into how the ELO system of rankings placement works, I've decided that I'll be doing the Individual and Team Ratings for wars using the following site's calculator:

http://www.kosteniuk.com/EloCalc/elo.php

I'm going to use a baseline of 1000 points per player. Each individual's score will start at 1000 and adjust based on wins or losses. If you don't understand the way ELO Ratings work, feel free to read up on it at wikia.com. I'm using the FIDE system for my individual rankings. After I've collected some data, I'll figure out where I want to go with the team ELO ratings.