They aren't difficult animals to keep, I've had 2 for over 4 years now.
A Dragon is a big responsibility. While they can go on without any attention for days, they need care when they are growing up. The other thing is that they're very social animals and just having one in the tank is not going to be nice for the poor thing. A mirror will work well for the first few weeks but once they figure out that it's not a real dragon in the reflection they start to ignore it. Mine spent at least a week non stop in front of the mirror when I put one in, then they just went off it completely.
In terms of diet, once they get older they will do with mostly a fruit/vegetable diet. Mine love soft fruit, berries, anything that's red and lettuce.
As for the tank, it should be fairly big. I have a couple, the tank is 150x40cm and 50cm tall. It's not big enough for them so they have to run around in the room.
Other things to consider - they need a UVB 8.0 light, vitamins and calcium.