As far as the one page thing, I think that if you can get everything on one page such that it looks presentable, then you should. However, if you can't, then try to get the most important stuff on the first page...and if you're going to have two pages, use all of the space of two pages. You don't want a lot of white space on the resume. I'd also add dates to your certifications, if that's applicable.
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