Adsence

so.. I wonder how Google adsence works, I just think it didn't make sense, So I'll publish my blog's adress all over the internet to get more views, then I can guarantee a fixed amount of cash going into my account, but how can I earn cash if I don't have a credit card??

I heared about a thing called EntroPay, but I dunno how it works.. it's like a virtual visa card but it's scary, I an't create an account unless I know everything about it, so wish me luck or kick ass...lol