Ok I know this will probally sound crazy and I just want some clarification. I have been all through the books with the "rules" for MT's and I can't find anything that states a standard text size? Am I missing something? I want my practice to be as close to the real thing as possible in layout etc, and just what clarification??

Actually not a dumb question at all! Text size will be according to your client preference. I've worked on accounts that wanted 12 pt font and others that wanted 11 and some 10 even. For the course, I'd use 12 pt since it's larger and easier to QA and find your errors.