Proceeds given through credit/debit card are processed through Stripe and will be transferred to your bank account through that application. For more information, go here.
If readers supported your newsroom with ETH, you'll need to transfer the funds out of your newsroom’s wallet into Metamask to transfer to a service like Coinbase. You will see your newsroom’s proceeds in your newsroom’s wallet and can withdraw your ETH proceeds to a connected wallet by navigating to My Dashboard > Newsroom > click “Withdraw” under the Boost section. Once selected, click “Transfer” and complete and confirm the transaction using your wallet to transfer the funds.
Then, you can convert that transferred ETH to a fiat currency (like USD) using Coinbase or Gemini.
Please make sure that Coinbase supports the country of your bank before starting, and note that it's always a good idea to "practice" a transfer by sending only a small amount of ETH to Coinbase and seeing that confirm before sending the rest.
There is a very small network transaction cost for transferring ETH. Usually it’s a matter of a few cents. This cost goes to the Ethereum miners who perform computational work needed for your content to be included on the Ethereum blockchain.