I can't help you with the ATM thingy since I haven't even seen one personally nor tried it. And I also have no plan of it as a business but you should also consider the popularity of bitcoin in your place. Whether there are a lot of users that might use your ATM or not. Start your planning before purchasing one. It's always better to start with a plan. Estimate if you'll be able to gain profit from it, how big is the possible profit, and the time.