Buy a calendar that works for you. Keep one master calendar for yourself. Multiple calendars create confusion. I use a book size calendar that shows the entire month on two pages. When I'm traveling or have a lot of appointments, I transfer my daily schedule to an index card.
Index cards are cheap and easy organizing tools.
Save the cards if you want a daily journal. Once you've cleaned up your office, try to keep it neat by avoiding the paper pile-up. Throw out the junk mail right away. Put the bills in a file and keep them in a safe place for check writing. Pass along as much mail as you can to key employees.