Its easy really. Find something on aliexpress that you can buy for a low price and retail for a high one. Have it drop-shipped from your supplier via e-packet to your customers in the USA. Sell ten of these a every day with a profit of 10 dollars each. $700 dollars a week, $2,800 dollars a month. But you will need a reserve to keep processing orders while you wait for paypal to transfer your funds to your bank account.