It is really important to leave a new snake alone for a week or so. Moving a snake into a new home is very stressful for them so they need some time to settle in. Leaving a snake alone doesn't increase the chances of you getting bit.
I would go with the 2 foot, with BP's smaller is usually better. You want to have 1 square foot of floorspace in the cage for every foot of snake.
A hiding BP is a happy BP hides are extremely important.
Checkout these 2 threads they should answer most of your questions:
Care: http://ball-pythons.net/forums/showt...ius)-Caresheet
Cage Heating: http://ball-pythons.net/forums/showt...t-Thermometers
If you still have any questions feel free to ask
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