Wagner leitmotifs

As part of an extended project for school I have to look at and analyse a piece of Wagner's music and look at how it tells the story and conveys emotion. Ride of the Valkyries was recommend to me and I was wondering which bars of it I should focus on.

For a bit of a wider context I'm going to be comparing and contrasting it to Chopin's ballade no 1 which contains melodies reminiscent of the aesthetics of Italian opera which is something Wagner rebelled against.

Thanks for any help you guys give me