Research and planning constitutes 20% of your final coursework marks and 50% of your final AS grade.
There are several areas you need to consider. The first is what genre of film you are making and who the target audience might be.
You will be making a thriller, but this is a very general concept. What sub-genre of thriller might your film be labelled with?
Analysis of Film Openings (3-5) - This should be included as an additional source of research and planning – you should begin to focus on films similar to yours. Use this format to find inspiration but also to help present your ideas... http://www.artofthetitle.com