Hi,
Make sure you pick up a good digital thermometer with an probe and in built humidity (most peeps recomend the acu-rite from walmart for $12). Knowing your temps and humidity is one of the most important things you need to achieve.
Avoid those little round stick on things most pet shops sell as they tend to be very innacurate.
Also think about how you are going to regulate the heating and what types of heating you might need (depends on your rooms temps and how stable they are). There is no need to drop the temps at night unless you are trying to breed so avoid buying a heating source that gives out visible (to the snake) light as using it 24/7 will throw off their day/ night cycle and turning it off at night will obviously mess up the heat.
You are doing exactly the right thing getting it all setup, calibrated and tested before he arrives as well.
dr del