I would argue, that most of the shadows in the pictures are form shadows, but that's besides the point. I would recommend, you analyze the picture as best as you can and when you unsure you just decide weather you think the shadow(s) in question are important enough to include or not.
I will try to analyze my best but should I consider the form shadow as cast shadow in the exercises?
You mean to change the light intensity?
according to the texture video, I decide which shade I should choose
I think I would not differentiate between form and cast shadows, at least not for the paper texture. And yep, exactly as stated in the video you choose which parts you think are important enough to include. I don't quite understand what you mean by changing the light intensity, could you elaborate on that?
This recommendation is really just for those of you who've reached lesson 6 and onwards.
I haven't found the actual brand you buy to matter much, so you may want to shop around. This one is a "master" template, which will give you a broad range of ellipse degrees and sizes (this one ranges between 0.25 inches and 1.5 inches), and is a good place to start. You may end up finding that this range limits the kinds of ellipses you draw, forcing you to work within those bounds, but it may still be worth it as full sets of ellipse guides can run you quite a bit more, simply due to the sizes and degrees that need to be covered.
No matter which brand of ellipse guide you decide to pick up, make sure they have little markings for the minor axes.
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