Can anyone tell me how Google and Adsence Works!

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I would like to know if I join these, if it is going to cost me alot of money in advertising, or if I have alot of websites, will I make money without advertising. I've ran across a company that will set up 300 websites for you for $25.00 for you to make money, but I don't want to invest alot in advertising, and I hope that if I do this that I can make money with just having these sites. Can anyone help me, and tell me how it works? I am looking for something that will make me about $800.00 per month. Please help me, if you have any other suggestions on how I can make that much per month, please feel free to tell me, and I will check them out. But all opportunities must allow Canadians to take part.