This applies to a completely new work you have created; it does not contain other Creative Commons works or adaptations.
What CC license can you apply to a self-made work:
Your institution's prescribed license
Institutions may prescribe a specific licence. Rotterdam University of Applied Sciences publication policy advises a CC BY license for publishing research. There is currently no policy that applies to educational resources, though CC BY is also commonly advised for this as well.
Any of the 6 CC licenses
If your institution has no prescribed license, you can choose any of the 6 CC licenses.
Which you should choose depends on the kind of (re)use you want to permit.
Under ‘What is Creative Commons’ you can check out each of the licenses and their conditions.
Take note: If your work contains copyrighted works without a CC license, make sure sharing is allowed! An example of this is the use of a table to illustrate a point. Make clear these specific works are ‘all rights reserved’ and provide attribution. Make clear in your CC license that it contains these works, e.g. “Except otherwise noted, this work is licensed under the CC BY 4.0 license”.