how to write a rhetorical analysis?

how to write a rhetorical analysis?
I have to address cultural stereotypes from a movie, song, etc. I chose Legally Blonde. How would i start out the essay? What rhetorical strategies are used in this movie?? I need help.

a rhetorical device is something used to persuade, so think about how the main character is used to persuade the audience
for a start, in western cultures the audience thinks she will be a dumb blonde- which is a stereotype- and this stereotype could cause the audience to like her. talk what are the connotations and denotations of pretty blondes etc (e.g. blonde is similar to gold, people assosiate gold with light,happiness therefore asssosiating her with hapiness) and how do these persuade the audience to warm to the character and thus enjoy the film..