If you are buying an hatchling or juvy go with a 6 to 12 quarts tub, this is important, you g individual do better in smaller enviroment, and since this will be your first snake it is important to provide an optimal enviroment that will be stress free for the animal and will allow you to observe and learn what a normal ball python behaviour is.
They do not need UV (those are nocturnal animals) nor do they need calcium as the prey item provides the necesary amount of calcium.
Here is a guide for new owner just like yourself it will cover your supply list, feeding etc .
Last advice stay away from places like YouTube and such, there is a lot of misinformation, incomplete information, potentially dangerous advice and no one there to oversee, in other words a lot of self proclaim expert.