Pull: The first thing to do when reorganizing a space is to pull everything out and sort through it.
Purge: Towels and sheets that are stained, ripped, or just old need to be donated. If you have old/expired or almost empty products - ditch em. Keep a pen and paper nearby to write down what you need to buy after you've purged.
Purchase: Now you get to buy everything on that list you created when purging the closet. Try and buy in bulk if you can, and buy some pretty baskets that you can use to store the odds and ends that can make the closet look cluttered.