Your paper should not just be a book report or a summary of others' work. It should have one main POINT, or argument. To qualify as a point, the main idea of your paper must be:
(1) debatable ("the sky is blue" is not debateable; "MTV videos help reproduce male power over women" is debateable.)
(2) supportable with evidence from your own and others' research.
So it should not just list a topic area and some information (e.g., "this paper will be about rock videos and will use evidence collected from journal articles.") It should make a distinct argument, e.g., "This paper will use textual analysis to argue that rock videos sometimes have the potential to reinforce male dominance."
Also, the proposal should explain what scholarly literature, theories, methods, and evidence you will use to support your argument.
Making a scholarly point or argument is not exactly the same as expressing an opinion. We all have lots of opinions that come from our preferences, experiences, values, and so forth. In scholarship, however, the point is not to express your opinion, but to offer a reasoned, logical, well-supported argument that addresses counterarguments and provides substantial evidence. Everyone has opinions, but scholarly arguments are something presented by experts, by people who have done the work of mastering an area of thought and who present the results of their expertise. Your goal over the course of semester is to become an expert on the topic you are researching.