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I am doing major changes in my website some of my old url pages i don't want them to be indexed or submitted in site map some of other old pages i want to keep them and there is new  pages any one  can give me hints what should i do also I have thousands of pages on my website and I don't want to submit all my pages i want to submit best pages to google in sitemap that why i want to resubmit new site maps

Google says one to discover whether my pages is index in Google is site:domain name of my website: https://support.google.com/webmasters/answer/34444?hl=enas mention in web page above so basically according to that i can know totally pages indexed for my website right:it shows me when type (site:domain name ) 300 but it says in Google web master that i have 100000so which is the real number of index page 300 or 1000000 as web master says and why i get 300 when using site:domain name even Google mention that it is way to discover index paged

when i type site:jamalon.com  to discover number of pages indexed it gives me different result  from google web master tools