Hi, all. after lots of reading, I take action several days ago. I choose 3 products from CB marketplace with gravity ranging from 10-40, all 3 products are health-related niche. Then I opened an account in Bing ads and bought a $100 bing coupon in fiverr, and start my 3 campains. All PPC keywords are taken from the affiliate pages providing by the vendor. 4 days after, the $100 coupon has been used up without earning me a dime. Anyone knows what's wrong?