Hey!! This is a really tough task for sure! I'm sure there'll be a tonne of tips from others but in terms of where to start, you need to come up with your main idea(s). In an essay, these would form your paragraphs, but in this they'll form your question. You need a big umbrella idea (the THESIS) and some sub-ideas/themes.
So let's say you want to discuss a theme, "the inevitability of death." Totally random. A Thesis statement might be:
"Campion's Bright Star gives a greater insight into the context behind the harrowing portrayal of death in Keat's poems ___ and ____."Once you have them, you just rephrase it as a question:
"So Jane, one of the big things we see in Bright Star is Keat's health struggles.. I imagine some of his poems were a huge insight into portraying the emotional aspects of that?"See how it's sort of the same thing, just approached from the opposite direction? Essentially, the interview and the essay are the same thing. The interview is just structured in question/answers that match the paragraph in the essay. The question does the job of the topic sentence, then the response (might also add to the topic sentence, but then also) is the body and the conclusion
So come up with your ideas first! Make a list of themes and let them guide your questions
PS - I deleted the copy of this you posted in the Marking section, but you can always post a paragraph there for feedback later