AQA B English Literature

So I've got an essay due in on Wednesday on the poem I chose, 'O What Is That Sound' by WH Auden. The question is 'How is the story told in 'O What Is That Sound', basically the teacher told us to write about the opening, the structure, the use of place, voice, and anything else significant. I'm really struggling with exactly what to say and how to say it. What type of this should I include exactly? Just some rough ideas about what exactly I need to do because I'm soooo confused! Thanks a lot