You're going to need an appropiate-sized UTH that will cover 1/2-1/3 of the bottom of the enclosure, a thermoSTAT to regulate it, and a thermoMETER to measure both your temps and humidity.
Budget thermostat:
http://www.amazon.com/Hydrofarm-MTPR...ords=hydrofarm
High-end:
http://www.spyderrobotics.com/home/products.html (A Herpstat Basic is perfect for a single UTH and is definitely what I would recommend if you can afford it)
There's really only one thermometer that most people on here will recommend. It's a single unit with a probe, that will measure your hot spot, ambient temps, and humidity. Best part, it's available at Walmart.
http://www.walmart.com/ip/Acu-Rite-I...mometer/896347
Here's a good topic that will help you get your tank set up so your little one will be happy and healthy:
http://ball-pythons.net/forums/showt...p-w-pics-*DUW*