For some good ideas and outlines, google this:
essay compare contrast alternating opposing
You will need to choose alternating or opposing for your essay.
You'll have to capture the "meaning of the novel" in that first paragraph so that you can make a thesis statement about how the differences of their relationships to the culture support the author's theme.
After that, plan your paragraphs according to whether you choose alternating or opposing style.
The main theme of the essay will be a unique observation you make about the significance of the differences/similarities in their relationships to the culture.