One key to staying organized is to do as we've always taught our children, "When you're finished with it, put it away."
What if "it" doesn't have a special place in which to be "put away"? Create one. Here are some ideas:
Clean off your desk at the end of every day. Piles create clutter and can hinder good customer service. If a customer calls with a question about an order, it is much easier and faster if you simply have to pull out that customer's folder from an alphabetical file, or a pending orders folder from a work file.
When your desk is in order, you can handle tasks quickly and efficiently thus saving lots of valuable time.