there are only a few moderators but their role is minimal (only construction of grand structures and anti greif prevetion).
However, there is a "hands off" approach to moderation. It's pretty much do whatever you want (lava and tnt are fine etc) but the community on the server is very polite and helpful. Just build your stuff a ways away from spawn and you'll never be bothered. Spawn is notorious for having traps laid for newbies..better to go off into the wild and stake your claim.