google SEO

Hello everyone, I'm new in SEO.

So, please help me with a question

I cant understand where can I find the accurate statistic on google request search, I try use many free soft trafic travis and web seo and google adwords but I get absolutely nonsense results. And where can I find statistic for yahoo bing msn, I mean I enter how to lose a gay and i wanna see the search number of exactly this phrase?

for example health exercise and "health exercise"

111 000 000 (0,34 sec.) and 471 000 (0,26 sec.)

Does it mean google knows about 111000 000 pages with this two words and there 471000 pages that contain exactly this keywords, I mean all this 471000 pages try to be optimazed exactly for this keywords

So if I try to optimize site for health exersise - what the real numbers of my competitors for SERP? the first number or the second???

Or for example "diets to lose weight" - 60 600 and 19 400 000 for this request without quotes, and where can I find how often do users ask this request - google adwords says that its 49 500 - does it mean that users all over the world during the last month. Does it right?

So am I right if I focused on exactly "diets to lose weight", and try to optimized on the whole phrase, its will help me to win competition with the other 19 400 000 pages, thats contain this words by accident.

And I'm very suprised to see subdomains on 1st SERP, what google think about it

Thanks a lots in advanced)