You will find that different types of leather call for different storage methods. I have mostly firm chrome tanned leather which I roll up and store in a dark, dry space. I have a few veg-tan hides that I keep rolled up in butcher paper so that the surface does not age irregularly. I hang some of my softer leathers (goat, pig, deer, garment) on some hooks, again in a dark, dry space. Some people store their hides rolled-up in PCV tubes, and others store them flat.
I have to add that I roll the hides with the grain on the inside so that color does not get exposed. Then I can more comfortably stack them on top of each other.