Coin fortune telling, new coins or old coins?

That's not fortune telling, it's divination gossip. It's best to get three Qianlong Bao Tong copper coins, and then get the shell of a red-edged turtle. That's the real divination. Nowadays, people just need to shake the money by hand, so they don't need to invite teachers. The method of replacing turtles with money is almost lost. This method, see the complete works of Duan Yi.