Tub size

Hello, i am looking forward to getting my first ball python. I will be getting a baby and i am just wondering what size tub and set up i should have.
Thanks

I know a lot of people start with 5-15 qt tubs for the little ones, but I use 28qts without problems: I just add lots of fake plants and crumpled up newspaper to make the snake feel secure (along with the two hides).

Thanks

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What size heat pad should i use For a tub 11.5 x 17.5 x 6.5. Thanks

My list of Tub sizes:
6 qt - for hatchlings
16 qt - 500 or less grams
28/32 qt - 2000 or less grams
41 qt - 2000 + gram adults

You want the heat pad to cover around 1/3 of the tub.
So the small size of petstore heat mats should be fine for a hatchling, but be prepared to upgrade soon as babies grow pretty fast.
Buying heat tape is cheaper.