Hello,
Welcome to the forum & to the world of Bearded dragons.
One of the most important things to do first is to make sure the tank setup is correct.
When do you plan on getting your new dragon?
As far as night time heating you wont want it to get real hot, no. We usually recommend using a ceramic heat emitter for any warmth if needed. If the night temperatures fall below 65F or so, then you could use some heating. Just be sure it is a ceramic heat emitter & not a red or blue night lamp. That will disturb their sleeping.
You can
bathe them, as some do enjoy it. They are all different though, so some may love them while others hate them. You will have to gauge the behavior to determine how many baths you want to give. We don't recommend them too often because they might get stressed by getting too many.
They are very social creatures indeed. They do like music from what I can tell. You can experiment with various types of music to see if he/she seems to prefer one over the other. I don't recommend having it super loud though as that could get stressful I would think.
<<< TV is a winner with all mine, even from very young....
I am sure others will chime in with more stories & information.
Tracie