The Research Data Management Policy at NUI Galway defines a Data Management Plan (DMP) as "A formal document that outlines how data are to be handled both during a research project and after the project is completed. The goal of a data management plan is to consider the many aspects of data management: metadata generation, data preservation, and analysis before the project begins; ensuring that data are well managed in the present, and prepared for preservation in the future."
The policy requires that:
NOTE: a data management plan is a living document that grows with the project.
Information about data and data format
Metadata content and format
Policies for access, sharing and re-use
Read about costing data management at UK Data Service https://www.ukdataservice.ac.uk/manage-data/plan/costing
DMPonline a tool to help you write your data management plan. It contains templates for most of the major funding bodies. Make sure the template you use is compatible with the requirements set out by your funder. There is a short tutorial at the link but the tool is straightforward and easy to use. Just sign In to create an account and get started. Some funders mandate the use of DMPonline, while others point to it as a useful option. You can download funder templates without logging in, but the tool provides tailored guidance and example answers from the DCC and many research organisations.
Data Stewardship Wizard from the GoFAIR organisation provides a smart questionnaire to guide you through the creation of a data stewardship plan. It includes hints multimedia content, external resources and help.
There are many data management checklists available that explain and guide the process of creating a data management plan. The Digital Curation Centre provides a checklist as well as guidance and some examples.