While the requirements of each funding agency are different, there are several common elements to all. These are things that you should be thinking about, in general.
While most people think about digitally-stored data when they think of "data management," please don't neglect to include printed material and physical samples.
This introductory course, funded by the Office of Research Integrity and the US Department of Health and Human Services, outlines good practices for data management and answers questions such as "Who owns the project and its data?" via case studies.
This tutorial provides more information on ownership of data, access to data, retention, and potential problems.