It all starts with what your clothing needs for optimal storage.

If your clothing can be folded without harm (t-shirts, levis, knits) you would need more shelves, fewer hanging rods.

If your are extra-tall, you need to make sure the hanging rods let the shirts hang instead of dragging.

Shoes: how many and what size?

I think you begin by determining what the closet needs to house, and go from there.