Need help comparing Horatio and The Common Man

Hey everyone, I could use a few suggestions for the following essay topic which I have to write tomorrow so any imput would really help. Here's the topic:

Write an Essay to prove that Robert Bolt And Willian Shakespere make similar use of fifth business characters to further their plots and strengthen the character development of their protagonists.

Any suggestions would really help cause I'm doing poorly in my English class. Thanks and take care.