As you are a new keeper, I'd recommend getting one light for heat, and a separate light for UVB. Once you have a bit of experience under your belt, it's a little easier to know how to control them together. So for the heat, it's pretty simple. You can go to the hardware store and save yourself some money. But a clamp light fixture, the kind with the ceramic base. The plastic ones are cheaper but don't hold up well with the heat, so ceramic is better. There are usually two sizes, I'd recommend going with the bigger one that is rated for 150 watts bulbs just to be safe. You probably won't need that high a wattage but better to be safe. As for the bulb, just buy a normal PAR 38 halogen outdoor flood lamp. The wattage will largely depend on how far away the bulb will be from the basking area. Generally if it's about 12 inches away, a 75 watt should work. If it's farther away, then you may want a 100 watt bulb. Make sure it's a flood light, not a spot light, so that you get a nice wide area for your lizard to bask in. Also, best to get the outdoor rather than indoor ones as they are a little more rugged and hold up better in your enclosure.
For the UVB, I would recommend getting either a ZooMed T5 10.0 fluorescent tube and fixture with reflector or the same thing in the Arcadia brand (they call theirs the T5 12% though). Those are the two best brands regarding those types of bulbs. Remember to get the T5 high output fixture with them, with the reflector in it. The reflector will give you about twice the output from your bulb as it reflects the light from the backside of the bulb down into your enclosure. The bulb should be about 2/3 to 3/4 the length of the enclosure. This light should be mounted right next to your basking light, directly above the dragon, and all the way over to one side. You want to give the lizard the ability to have an area of the enclosure free from UV exposure, so that's why you mount it over to one side.
As for substrate, there are many different choices. Some people when they are first starting out just use paper towel as it's a little simpler to clean. Some use tile or linoleum as these are non porous and again simpler to clean. Like lighting, once you get the hang of things you can start looking at more complex substrates like bio active soils too.
If you have any other questions feel free to ask away!