So I was wondering, should I pay google for ads to my site? And then when my site ogt hit by popularity to put adsense on my website and to get clicks from that users?
you can't run adsense on sites which are getting traffic by PPC programs! you can use only one! else you will get banned by adsense!
You sure? I've run adwords and adsense before for the same site, and I run a few PW campaigns too. PW isn't PPC though. I know you can't buy traffic though, but that's not the same as advertising.
I don't pay google (for driving traffic) to get paid through adsense. If you can't find any other option to drive traffic to your site, then go for adwords; otherwise, there is no need.