Essays / Key incidents and characterisation in "The Curious Incident ..." [6]

Hi everyone,

So for my next upcoming assessment task, I have been asked to write a essay on The Curious Incident of the Dog in the Night-time. I am planning what I am to write about in my essay, and I have come across a few problems.

1. Should I set out my paragraphs, but speaking about themes.
2. Should I being setting out my paragraphs by speaking about 1 - the themes ( all of them, or major ones?), 2 - the form and structure 3 - the language features.

If I chose option 2, how would I incorporate key incidents and characterisation?

What should I be looking for in this close study essay?

If anybody could help me, that would be great!

Thanks a lot!

:)