I need help with blogs

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I have heard alot of people keep talking about writing blogs and making money doing so...so I was just wondering if anyone could help me...I want to know where you go to write these blogs and how you get paid for writing them..I was told one time that you got paid for everyone that read the blog and then I was told that you got paid only if they clicked on your advertisements...so I don't really know what to believe anymore..does anyone have any good ideas that coudl help me..or just explain to me how it is done..thanks in advance!