Film Treatment- What happens in the whole film?

Despite only filming the opening to my film I need to think about what will happen in the whole movie, just not in as much detail.
Genre: Drama/thriller

• Young adult/teenage girl wakes up with a bruise on her face- the audience doesn't know how it appeared until later.
• The girl gets dressed and ready whilst the audience sees shots of what happened the night before- as if she's remembering. The girl recieves a phone call from a man saying that she needs to talk to him, hinting that something has happened(this is the end of the two minute opening)
• It turns out the girl is involved with drugs as well as helping to deal them with the man who turns out to be her abusive boyfriend
• The girl dreams of being someone important and worthy but her addictions and poor relationship borders her from ever being able to achieve this
• There is chance for the girl to get out and restart but her boyfriend stops her and the audience realises she has a failed dream and that her life has taken over.

This is only the very first idea for my film, as I continue to do research my idea should develop and progress further, cutting out bad ideas and thinking up of better scenes.