How to buy ETH from ATM?

Could you please explain to me in detail the steps involved in purchasing ETH from an ATM? I'm a bit new to the world of cryptocurrency and am still getting my head around all the terminology. Do I need to set up a special wallet or account first? What type of ATM do I need to look for? And once I've found the ATM, how do I initiate the transaction? Also, are there any fees associated with purchasing ETH from an ATM? And what's the estimated transaction time? Your help would be greatly appreciated as I'm eager to get started in this exciting field.