Ultimate Blog Marketing

Recently i added my blog with google analytics, after that my revenue has reduced drastically very low. I do not know the reason. I would like to the differences between the two.

I was wondering because both my parents think that google adsense and a YouTube Partnership can get hacked can it? (As in can they steal your adress?)

Hey there I would like to know how google adsense pays you. As in…. do they send personal checks or payout to Paypal because I dont want to apply unless they payout to Paypal. If they do not could someone point me in the right direction to get paid by paypal for putting advertisements on a blog?

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Is there a way that I can put different key words for different menus of each page?
I have a website with many menu bars. Somehow whenever I click different sections, all the same google ads appear. Each menu has a different characters, so I would like to customize ads for each sections. Is this possible to have different google ads for each page? Thanks.

My website has almost no text so if I use Google Adsense, will I get adverts that have nothing to do with my site?