The best advice for ANY affiliate site is not to create pages that mostly duplicate the content of another site, even Amazon (or whatever business is running the affiliate program). Google is looking for pages that they can send users to that are unique and informative for the traffic they send, rather than a copy of information a user can find many places.
Thank you for the advice. I was thinking of maybe including a link to purchasing the product through amazon on my own content and then adding no follow to that too. But I'm not quite sure if you can do that with amazon affiliate as I haven't signed up yet. I'm pretty sure i've seen other sites use this method. I'm guessing this way although probably not as effective in getting sales is probably best for site quality.