No doubt there is always room for improving your meta tags, you could spend countless hours working on them and then come up with a great meta tag for every page, As great as it sounds this is a waste of time unless you have nothing better to do (if you are working on a website you always do), The reason behind this is very simple, Meta tags although important, perfecting them is a lengthy process, and taking into account that major search engines hardly if every use them, you would end up better off working on your website's content, it is what is actually weighted and it really pays back to add new useful content.
 

So how should i make my meta tags

Your meta tags should simply be done by making your mind up on the keywords you want to target, making sure they are in the content of your pages, then adding them, remember don't try to fool search engines, as they are becoming more complex every day and you never know how your attempt will fire back at you.

the bottom line is a KISS (Keep It Simple, Stewart)