What is "snow"?Hey, I'm a know nothing too, I'm just crazy enough to think I might get it right eventually...;-]
Ruby, give some thought to how much snow you might end up with on that roof. A steeper slope (e.g. 5" per 1') will likely get the snow to slide itself off and never really build up. Also, make sure your material is smooth, not like the fiberglass panels where the surface is coarse, it will also help the snow slide off. Finally, make it slope down to where you want the snow to go.