Finding a soundtrack & start of story line

I think it is a good idea for a few reasons to look at the sort of soundtrack before properly developing on the story line, so then you are sure your the soundtrack will go with the story line and film ideas. There's 2 main sound tracks I am looking out for. The basic opening story line is.
1. Blurred artistic credits
2. Focus to a student from in trousers down pointing his bum outside the gate acting stupid the public acting stupid.
3. Main character walks past speaks to the trousers down student about something they are doing that night and walks of trousered down student carry's on and speaks as if nothing is weird and as soon as main character walks of screen you see a teacher notice and start to chase him as he runs away.
4. Main character arrives home and speaks to camera about school as he takes of his coat and shoes, and does normal getting home activities.

I have a feeling I will be switching the story line quite a lot but there are bits I will try to stick to like the mood switch bit, but this story line is just something to start from.

I will list some of the songs I have gone through and liked the idea of soon.

I think the next step is to start story boarding a bit.

I want a electro synthy chilled out sort of sound for the very opening and then i was thinking of using the king and I by the kooks after that bit.