So your getting a bearded dragon soon? Well you'll need to know what type of enclosure you need. 
 
First you'll need the enclosure itself, now you can go with tanks, wooden enclosures, PVC enclosures, ABS enclosures, and vision enclosures. However i will be going over the tank enclosure and providing a bit of info on wooden enclosures as well. 

So what size enclosure do you need? Well the minimum for one bearded dragon is 40 gallons, however 75 gallons would be preferred and you will actually have to most likely upgrade to that within the first or second year. Now you could keep the reptile in a 40 gallon but it isnt going to exactly thrive in a small space like that. This goes for glass and wooden enclosures.