Bearded Dragons are awesome pets! I have a few any really enjoy them. They can be expensive though and they eat a LOT.
You do need to get a tank. One beardie will eventually need about a 50g or 60g tank. It's better to start off with a 20g tank if you get a younger one. It puts less stress on the animal and it makes it easier for it to find food etc. This will last for a while before you will need to get it's adult enclosure.
You will need a UV light and also a heat light. Put the heat light to one side of the tank. This will create a hot side and a cool side. Beardies like warm temperatures..the hot side should be 95f to about 105f and the cool side 80f at the lowest. Buy a thermometer (preferably digital) to read the temps.
Beardies eat crickets, mealworms, superworms, hornworms, roaches etc. Crickers are a staple food you can buy at pretty much any pet store. Before you feed crickets to your dragon they should be "gut-loaded" which means you feed them healthy food so your dragon is eating a healthy, nutricious cricket. Insects should be supplemented with calcium and vitamin powder. I use ReptiVite vitamins. To supplement, you "dust" the insects by putting them in a bag or container and adding a small amount of powder and you shake 'em! (Not too hard LOL) This will lightly dust the crickets in powder. Calcium a few times a week and vitamin once or twice a week.
They also eat veggies..dark leafy greens are best. I will try and find a link to a food guide. Some veggies are bad for dragons so make sure you research.
They get their water from veggies and also from occasional tank mistings.
Ummm that's all I can think of right now...I'll give you a link to an awesome group of care sheets and if you have any other questions I'd love to help!
Exclusive Dragons - Bearded Dragon Care Information Library!
OH and here are some pictures of the little fellas