Age of Sigmar is very much down to the players this time, rather than us setting a "Wounds" or "Scrolls" limit. But, time is of the essence, so I wouldn't go too big and never finish your game.
In the future, I imagine there will be tournament packs organised by some of the big associations down south and indeed across the globe. So, future wise at least, there might be a suggested guideline for running Tournaments at the club. That would be the only time it would be "restricted".
It's more likely however, that we will see actual campaigns taking off at the club to support this competitive desire in us. More on this soon!