Welcome to BP.net!
Though the chance of contracting salmonella from your new ball python is rare, there is still a small chance.
Washing your hands before and after handling is a good practice to get into.
x2 on keeping the snake away from your face. In the infra red spectrum, your face is one of the hottest parts of your body. Ball pythons use the heat sensitive pits along their upper lip to map out the world around them using heat signatures. 99 times out of 100, nothing is going to happen, but that 100th time may end up being slightly painful, and very scary.
I suggest you take a look at the following:
http://ball-pythons.net/forums/showt...ius)-Caresheet
http://ball-pythons.net/forums/showt...p-w-pics-*DUW*
http://ball-pythons.net/forums/showt...Basics...*DUW*