Hi Cindy, I'm not sure what you mean. What does the interview have to do with the writing task? I think you need to write an essay about these three topics, so write a paragraph about each.
Let each paragraph start with a topic sentence that tells your main idea.
So, you'll have 3 ideas... one about each of the three topics.
Each idea gets a paragraph dedicated to it. Each paragraph starts with a sentence about that idea.
That is how to start. When you have written 3 paragraphs, look for what truth they all have in common. Whatever truth they all share, make that your thesis statement in the intro paragraph. Make it so that the intro paragraph ends with a thesis statement that tells the main idea of the whole essay.