Congrads on the research before buying the dragon! Really, the best way to get the info is to get a couple books, I checked mine out from the local library and search through the web sites that have all of the care sheets on them. I started with all of the web pages from the people that visit here on a regular basis. There is just so much info someone could post here, it is better to do a bit of reading and then fire away with the questions.
Briefly: many different types out there with colors rangeing from tan and brown to bright orange/red and white. Temps differ for the age of the dragon, and so does the food requirements. Care with opposed to snakes is ALOT more, as I found out with going from one young corn to two baby dragons! Just like your big snakes, the dragons will need a large (60-90 gallon) as adult, and that is just for one.
Hope this helps.
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Jamie
0.0.1 corn snake (Rio)
1.0.1 Bearded Dragon (Zeus and Koda)