Familiarise yourself with the website and update as much your profile as you can. 

Start registering the scores of your games.

The rainking system that we're currently using is "The True Rank". See below

The True Rank: This system is loosely based on Elo rating system which many believe to be the most accurate system for ranking player ability. The True Rank System awards points based on current points, margins of victory and opponents points. If enough matches are played, the best players will be at the top of your ladder. Any type of score can be used for the matches 

More information to follow. 

Richard