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Yes Yes and again Yes.

Nowadays No-Follow links pass link juice almost as the Do-Follow Links.

Let's look from Googles eye. If >90% of links are Do-Follow, it does not seem natural. Google may think that all the links are done by site owner to boost rank.

So both Do-Follow and No-Follow links pass link juice.

My site has about 50 pages. All of them are unique 500-700 word articles. Almost every page is on its keyword at the 4-8 position in google/yahoo/bing.

I can add a lot of relative unique pages on my site, about 100-200 word content per page. They all will be unique, with unique description and title. I can make about 1000+ pages.

Would you suggest me to do this? Will this action boost my SERP position.

Do more pages mean better SERP position?

My site has about 50 pages. All of them are unique 500-700 word articles. Almost every page is on its keyword at the 4-8 position in google/yahoo/bing.

I can add a lot of relative unique pages on my site, about 100-200 word content per page. They all will be unique, with unique description and title. I can make about 1000+ pages.

Would you suggest me to do this? Will this action boost my SERP position.

Do more pages mean better SERP position?