It sounds as if someone may have suggested to you that you can make money by signing up as an “affiliate” and then paying for traffic, with the hope of making money from the resulting sales. Perhaps someone is trying to sell you an “online course” or “program” or book which describes this strategy.
While it is possible to make money using this strategy, it is not as easy as many “promoters” suggest.
I’ve written an article explaining the “math” involved, and explaining why most people who try this strategy don’t earn a profit: http://www.MarkWelch.com/affiliate-arbit…
The article also provides links to a number of free resources about “affiliate marketing” and “search marketing,” including PPC.