I just bought a GT Sanction 3.0...and I am totally confused here.

1. How do the air adjustments work?
2. How do I adjust preload?
3. For a fork with 160mm travel, how much sag am I supposed to set up?

The Fox Float R is pretty plush, but the front fork is set way too stiff...at least I think it is. I'm new to this huge travel...so is the front fork supposed to be more stiffer than the rear suspension?