It sounds as if you're writing a larger dissertation on this subject and are looking to break it up into sections. If you are working on the fourth section, covering your findings and discussion, I assume you have already written an introduction (an overview of what you are going to analyze), a literature review (covering what some other scholars have written on these subjects and what the prevailing scholarly opinions are), and set out some objectives or thesis statements for your dissertation (what you hope to demonstrate through your analyses, and/or what key arguments you are going to make about Faulkner's storytelling). Your thesis statements and arguments should be set out in broad strokes first. The discussion and findings section is where you plumb these elements in depth (the "analysis") and then go on to convince the reader that you have proven your points, using supporting evidence from the text.
You ask about questionnaires—this would be something you might use for a quantitative survey, a scientific dissertation, or even a dissertation analyzing linguistic techniques, but I can't see where a questionnaire would be useful to you in approaching this topic. Rather, I think you need to call your chapter "Discussion and Findings" and then break it down into three sections for each of the three elements you are analyzing, perhaps with a conclusion which draws the discussion together to explain how these three elements contribute to Faulkner's specific storytelling style and help him achieve his purposes.
It's not clear from your question whether you have already determined your feelings about these three aspects of Faulkner's story, but if you are moving onto "discussion and findings," I assume you have some idea of what the symbolism in the story represents, how it fits into Southern tropes and uses its Southern context to help evoke a particular mood, and so on. Just to make it clear how we might structure this chapter, then, I'll use your first element for analysis—the narrative voice and position—and break it down as an example.
Findings: This is where you set out, factually, what you have observed from your study of the story. On the topic of the narrative voice, we can state that the narrator, although he never identifies himself explicitly, makes the overt choice to position himself as one of the townspeople who have observed Miss Emily: "our whole town went to her funeral."
Discussion: This part moves beyond the facts and begins to analyze. This means you need to ask "why" questions, rather than "what." It's not necessarily helpful to draw a stark line between "findings" and "discussion," however, because the one leads into the other—that's why it's probably better to break up your chapter around the three separate elements, rather than findings/discussion. Why does the narrator choose to position himself as part of the watching town? This certainly has the effect of making the story read as a piece of local folklore, something told by word of mouth. It also means that the narrator is not omniscient; he has drawn from local gossip to potentially elaborate on what he says (is he reliable?) and this adds to the Gothic feel of the story. It also ties into the Southern setting: the town is small, close-knit, and dominated by old-fashioned Southern class structures within which Miss Emily seems to represent the older, landed families who once had more control over the town than they now do.
I hope this helps you get started!