I assume you mean the writing questions. There is no one structure, it completely depends on the question and even then there are infinite ways you could approach the question. The structure has to be clear and logical, and has to make sense.
Sure, but that should be natural to you rather than something you're actively thinking about. Also, that list is potentially risky because you definitely shouldn't look through your article, realise "Oh no I've forgotten a triplet" and stick one in where it's not appropriate. If you're writing an article you definitely need facts, opinions, explanations and statistics but the others are useful but optional. And please, only use them when they're appropriate rather than for the sake of using them; there's nothing more painful than reading a piece that overuses rhetorical questions. One is fine, two possible, any more is bad.
That AFOREST acronym is useful but it's not a formula for success. If you include all of them, you are not confirmed an A*. Above everything, you need to make sure your argument is solid, powerful and above all, makes sense.