During your Premaster you will find a few websites very handy while studying. This is an overview of websites you might consult regularly:
Here you will find all relevant course information per course. If you search for RSM / Premaster you will find your courses. The course manuals will also be available on Canvas.
On Timetables you will always find up-to-date information about your timetable. If you type in the course codes or search for your programme of study, you will always find your courses. You can find out how to do that here.
This website gives you a nice overview of useful information on and within the EUR and RSM.