i have build an e-commerce site, and I'm slowly looking into SEO. My question is simple, should i nofollow pages like "terms and conditions", "deliveryterms", "contact page". The reason I'm asking, is that my Terms and Conditions are ALOT alike the other sites out there, and i think it would be 80% duplicate content - furthermore these sites are not relevant (in my opinion) compared to my product pages.
On my site i also have some DIY-guides, which i won't nofollow, since it's original content and very relevant to my site. So I'm only talking about pages like the above mentioned.
Should i or should i not nofollow pages like this (only pages with very limited unique content)? What are the pros and cons of doing one or the other?