How to make money by uploading videos in you tube?

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I have heard that people are earning money by uploading videos in you tube.SO can any body tell me what to do ? how to become a partner in you tube. I have already an account with you tube after that what i have to do? If I upload 2-3 videos and I got 1000 visitors to each videos then what I have to do? will they inform to become their partner or I have to apply or what is the procedure please share with me