Create an inventory of all the people/roles (potentially) involved in the research project, including their roles and responsibilities (concerning the research data), as well as how they relate to the university.
Get advice about the planned involvement of people involved who are not employed by Leiden University. From a data management perspective, the most important topics would be how to deal with information security, privacy, choice of infrastructure, and intellectual property.
Once you have a clearer picture of the data management needs in your project, consider the data management obligations and check if certain tools are new to the people you work with. Discuss with the Faculty Data Manager what would be the best way to ensure that all people involved have the information they need and are working according to the project procedures. Take into account that developing good habits and learning to use new tools usually requires some time.