Research. You need to know what others are selling before you decide what wares you will offer. Lots of people sell handmade items, but those who work hard to make their items unique in some way are the ones who truly stand out. After you’ve decided on a product, check out the other sellers on Etsy and find what they’re offering, and then figure out how you can do it differently.
Often, what happens is that we run into unscrupulous Internet Marketers (IMs) who have less-than altruistic intentions of extracting money from you rather than helping you to make it. However, this isn't something new. People have been falling for networking marketing, pyramid schemes, and affiliate marketing scams since before the start of the net.