Checkout this thread I wrote, it goes over how I recommend setting up a glass tank.
http://ball-pythons.net/forums/showt...With-Pictures!
As for what thermostat to get you I would recommend any of these:
Budget: The hydrofarm. These are cheap units that will get you by but don't offer much in terms of reliability, accuracy, or safety.
http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S
Midrange: The Dwyer, these are much higher quality than the hydrofarm, but aren't as accurate as the better thermostats on this list:
http://www.reptilebasics.com/thermos...stat-prewired/
Best: The hydrofarm line of thermostats are the best available right now. They were designed for the reptile community and are the most accurate. They also have safety features that the other thermostats on the list don't have. I use these and recommend them highly.
http://spyderrobotics.com/home/products.html
What type of light bulb is it? a regular household bulb, a white heat lamp, a colored lamp, etc?