G'day mate,
All that information is available in several books available from several different places. To answer your questions...
When setting up my animals I always follow the KISS approach - Keep It Simple, Stupid. The less complex and enclosure is, the less there is to go wrong. For one or two Bearded Dragons, I would house them in a 1200 x 600 x 600 enclosure, with a 50mm lip at the front and sliding glass doors. For the substrate, use newspaper, gap sand or red desert sand. For UV, a 2/3/4 foot fluro with whatever brand of UV tube you choose installed, run into a timer which I will mention below. For heating, I would install two light fittings, one fitted with a 100 watt spotlight globe, and the other with a 25w blue globe. I would run the spotlight into a timer, and then both light fittings into an IMIT thermostat, which would be located in the middle of the enclosure and set to 26 degrees. This would mean that your Beardie would receive a day night period with UV, but it's enclosure wouldn't get to cool during winter. If you wish to brumate your Beardie, you can simply adjust the timer, thermostat or both.
Others may do it differently but the above set up worked wonders when I kept minimal animals years ago.
