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Straight answers, including the ones that are not flattering.
It depends on the course. Each course page states the level (beginner, intermediate, advanced or all levels) and a list of concrete requirements. If a course requires nothing, it says so explicitly.
The estimated duration appears on each course page, next to the number of lessons. There is no deadline: you go at your own pace and your progress is saved.
Yes. The full syllabus, with chapters and lessons, is visible on the course page without signing up. Only the player requires having bought the course or holding a membership that covers it.
Some do. When a course includes them, it is stated in its syllabus and you can book a slot based on the availability published by the instructor. Sessions run on Zoom.