Wow, a BP behind a Coke machine. That's a cool find!
As far as heating for the snake, do NOT use a heat rock. It can easily burn the snake. Use a UTH (under the tank heater). It's a pad that sticks to the bottom of the tank and heats from the bottom up.
As far as bedding, you can just use newspaper or Aspen.
For temps, the snake needs high 80's to low 90's on the hot side and mid 80's on the cool side. Humudity should be around 60-70% in the tank.
Awesome that you are keeping it for the time being. Definitly make sure, if you aren't keeping it for yourself, that it goes to a responsible owner this time!