It can be helpful to see how other researchers have written their own data management plans. Check out these (sorted by funder template) and more on the DMPTool's Public Plans section.
National Institute of Health
United States Department of Transportation
Federal Aviation Administration
Check out this video that shows DMPTool functionality in under 15 minutes!
Learn how to use DMPTool! from Carnegie Mellon Libraries on Youtube
This 50-minute session gives a breakdown on the DMP Tool and the plan creation process.
Creating Data Management Plan with DMPTool from National Library of Medicine on Youtube