The Blue-Cloud project aims to pilot a cyber platform bringing together and providing access to: 1) multidisciplinary data from observations and models, 2) analytical tools, & 3) computing facilities essential to support research to better understand and manage the many aspects of ocean sustainability. Data management will be an integrated activity throughout the project lifetime and should be deployed and supported by the Blue-Cloud services as planned. An initial Blue-Cloud Data Management Plan (DMP) has been compiled to serve as a guidance giving directions. This DMP follows the Horizon 2020 guidelines for Data Management Plans as published by the European Commission. It is organised around solutions and approaches aiming at making data findable, accessible, interoperable and re-usable (FAIR). For that purpose, an overview is given of data (to be) managed by the Blue-Cloud project and solutions, both 'existing/already planned' and 'possibly to be developed' are given for applying FAIR principles. In addition, the DMP considers other aspects of data management, such as resources, data security and ethical aspects. This initial DMP will be updated over the course of the project whenever significant changes arise and/or more insights become available as part of the ongoing developments.