I have small conversation with two of my friends about how to get revenue USD 10,000 per month.

me: “I have online store to sell shoes. How to get revenue USD 10,000 per month?”

friend 1: “You should have good marketing. Invest on advertising campaign will help.”

friend 2: “You must have total products worth at least USD 10,000 per month. You will not get revenue more than your total products worth.”

I think both answer is correct. But how to get total products worth USD 10,000 per month my friend?