You won't need to do any reading before you start a FutureLearn course. All the materials you need will be provided once the course starts.
Many educators will provide a list of recommended further reading by email, or as part of the course materials.
Sometimes educators will provide optional links to articles in academic journals, for learners who have subscriptions, but we can't provide free access to these articles. Anything that is required reading will be clearly signalled as part of the course step, and will be available to all learners.
You can find more tips for what to expect when your course starts in this article: What to expect when your course starts