It's better to ask those questions in the newbie questions thread, but you have to get an account with a website like coinbase that accepts your country and the payment method you want to use. Buy some Ethereum and then sign up with a marketplace website that you can buy DBC with ETH, I would also recommend Kucoin.
"Especially Roosh offers really good perspectives. But like MW said, at the end of the day, is he one of us?"
- Reciproke, posted on the Roosh V Forum.