Most fish tank lights I've seen don't emit a lot of UV. If you go to the reptile section of your local pet store they'll have the proper UV bulbs. If you have the the fish tank bulb housing, you can use that and just get a desert UV light from the pet store. You'll need to get it very soon though.
What kind of bulb from home depot did you get? Like how many watts, infrared or regular light, etc.
You'll need something to measure temperatures. Probes are good and can be found online and at some pet stores. Read over the caresheet here and you'll off to a good start with your new beardie!