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[rachel83az]

So I understand it right that I need to do the coursework every week and not can wait for another week to complete it? (This are my first courses on this way). And I need a portable webcam for the proctored exam?

Right, every week you have to do that week's assignment(s). If you miss the assignment(s), you cannot go back and do them again; it's too late. They usually aren't much. For most courses, you watch an hour or two of videos and then do that week's quiz. Sometimes there are short writing assignments. For astronomy (and presumably chemistry) there are also math questions that need to be completed. 

If you have a laptop with an integrated webcam, you do not need a portable one to take the final. You can get one if you want but all you need is the ability to pick up your computer and scan the room with the camera. It's a bit awkward at times but not overly difficult.