And is it true that agents don’t like unpublished writers to have prefaces or prologues?

I am a thirteen-year-old boy (almost fourteen), and I take writing and English very seriously. I have begun writing novels for the teen/young-adult audience, and am wondering if I were to submit to an agent, do you think there would be a preference for font? Do you think it matters greatly? I mean, as long as I don’t send it in something like Chiller, I’m good, I would think.
My current favorite font is Palatino. . . . Would that be manuscript-okay, do you think?
http://www.linotype.com/1317/palatino-family.html

In a proportional font like Times every character only takes as much physical width as it needs on the page. In a fixed width font like Courier every character is specifically designed to take *exactly* the same width, whether it be a slim letter ‘i’ or a wide letter ‘w’. If you follow that through to it’s logical conclusion that means that, for example, the word ‘lilly’ in Times is quite narrow and yet in Courier is quite wide, almost double in fact. Which means therefore that when printing in Times, or any other proportional font, you will fit more words onto a single line and so the eventual number of words per page will vary quite significantly, with Times being far more economical on space.

Thus the end result – a document in Times will take less pages than one in Courier, with the discrepancy growing as the document lengthens.

Thank you for your response.

I only asked about the font due to the previous comments. So are you saying I should scrap my novel because it’s longer than 100,000 words?

If I have to write a shorter story first in order to prove my skill set, then I can do that, however in my first story the plot needed more than 100,000 words to tell it completely. I don’t want to shortchange the story just to fit into a mold. I will try to edit the word count, but not at the expense of the plot or the character arcs.