Thank you for your question and welcome to ADHDCentral.com.
Since every office and desk is different, based on what type of work you do, I am giving you links to tips on organization. This way you can choose the tips that might work best for you and discard the rest.
Organizing Your Office
Fifteen Ideas for Organizing Your Home
Everyday Organizational Tips
Organizing Your Monthly Bills
Organizing Your Computer
I hope you find tips that can help.
Eileen