There are no hard and fast rules for it, you just get together with some mates and decide on a schedule. Eg:
Month 1- build+ paint a 500 point starter army (min HQ+1 troops). Game at end of month. 3 points for win, 1 points for a draw. 1 point for each unit completed within the limit.
Month 2- add 250 points of Elites/FA/HS (for example) and game, points as above.
and so on and so forth. You can run it for as long as you fancy, and really do whatever you want. Sometimes you might want to mix it up by playing a team game or a game that gives double points, just to add variety. I've also seen ones where people have spent a month doing a centrepiece model building objective markers, having a mini-tournament or anything really. The sky's the limit.
So basically, go on and set one up, and I hope you enjoy it. I wish I could get my own gaming group to do something similar, it sounds like great fun.
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