Some states have no sales tax so you wouldn't have to deal with that there. But normally, the buyer pays the tax depending upon the ship to location. But you are supposed to pay the state the tax they pay you. If you're refer to paying income tax on your income from sales, there are states with no income tax. Still need to pay feds though. As far as online places to sell jewelry, ebay, instagram, Etsy. You can use PayPal or Venmo for payments like we do here. There are other options as well.