I need help understanding adsense cpc pay out

Hi warriors. I need help understanding how adsense works in terms of paying you.

For example if I go to google keyword tool right now and I was to pick this keyword:

sheilas wheels car insurance quote the cpc says $135.69

So I think google takes about 32% and you keep the other 68%.

So what does that mean? Does that mean that all of my ads appearing on my sites are going to be worth $135.69 or are some going to be worth less?
If that is the case, how will I know the value of the other ads displaying on my site?
How can I increase the value of each ad?

Ok so back to question 1. If my main keyword is worth $135.69 x 68%= $92.27 That means after google gets their cut I will make $92.27 for the top ad on my site?

Is that correct? or am I missing something.
Also I heard that if the users find your site through an organic search, then you get the most earning which will be your 68% share after google gets their cut.

Is they type your site straight in your url, you get the least, if they find your site through another site you get a bit more.
I am so confused about all of this factors.

I want to hire someone to build me an adsense site that has super high earnings for every ad, not just for the top one. Is that possible?
Does anyone in here knows how to build an adsense site where all of the ads make alot of money per click?

If this is possible then I would just hire someone to rank my site for my desire keywords even if it takes long, it might be worth it.

Anyways, please help me clarify how adsense earning works.

Thank you guys and ladies!