The physical details of Heaven, Hell, and Paradise in Paradise Lost. (thesis help)

I'm writing a paper about Paradise Lost with a focus on the importance of the physical details and I need some help with my thesis statement.

assignment's prompts/instructions:
"Discuss the importance of the physical details of heaven, hell, and paradise to what you see as the overall argument of the poem."

I have no clue as to what the overall theme of the poem is. I know the descriptions of the setting are important. For example, hell is described to indicate the torments satan and other demons are going through. Hell also is shown as a contrast to the bliss in heaven. Again, hell is shows in horrors to scare the readers.

I need help with writing a focused and precise thesis statement.

Thanks!

Just check out sparknotes for this sort of thing:
sparknotes.com/poetry/paradiselost/themes.html
Spend 10 minutes skimming around, and you will be able to appreciate any work of literature so much better! I know a lot of kids use sparknotes to avoid having to read the reading, but actually sparknotes is such high quality that it makes me WANT to get the book/poem and read it.

So, anyway, look there to find the main idea.

Then, you need to relate the physical details to the main idea. EASY!! :-)

Let me know what happens! Follow that link, identify the main idea, and talk about what those physical details have to do with it.