Good advice from kitedemon.

I second on getting a tub instead of a tank, it's a LOT easier to regulate things in from the start and the professional enclosures or even a larger tub will be easier in the end as well.

You NEED a thermostat. To attach to the heat pad. As kitedemon said. A water bowl, two identical hides (you can make these out of old butter tubs for a baby, as long as the snake can touch 3 of the sides when inside to feel secure, or little dollar tree bowls), and paper towel/newspaper or cypress/aspen? bedding.

Also I would get a temp gun and one of those $10 accurite indoor/outdoor humidity and temp gauges so you can monitor your temps and humidity.