Keep it reasonably under control though it doesn’t have to be cleared at the end of every day. An untidy desk puts stress on you and also gives the impression that you are barely coping with your work.
Have plenty of pens for noting down messages, and have a tray or box for can’t decide whether to file or in and every 2 months throw away the bottom half of its contents.
Think about where your desk faces corridors and windows can be too distracting, so sideways on might be best if you can do this.
Only have one task open at a time on your desk don’t worry, you won’t forget the others because you will have them on your jobs to do list, or in your diary: See if Fred has got back to me with the figures yet.