The essay is really straight forward. They give you about a half a page of space to write on a certain topic, I think everyone gets a different topic to write about. I suggest that when you get your folder when you get there you look through the papers and find your essay so you can organize your thoughts for a few moments before you begin.
The questions are not very difficult. Mine was something like, "name a motto in which you live your life by and give examples." Another person had one that said, "what was the last movie you saw and how did it effect you." You can pretty much take the essay in any direction you want, they just want to make sure you can communicate effectively in writing.