New to the game. Just some basic questions that I can't find in rule book

1.  Are there limits to the amount of objects that can exist in the same zone.  Not counting zone exclusivity.

2. The Beast Masters special ability says he can summon as a quick spell , a creature per round. Does this creature have to come from the 2 cards picked in the planning phase or is it taken directly from the spell book ? 

That's it.