How do I transfer USD out of Coinbase?

Can you please guide me through the process of transferring USD out of Coinbase? I'm a bit confused about the steps I need to take. Do I need to have a linked bank account set up first? And what are the fees associated with withdrawing funds? Also, is there a minimum or maximum amount I can withdraw at one time? Lastly, how long does the transfer typically take to complete? I appreciate your help in clarifying these questions.