Ok, well I got one for my first snake... So I am NOT an expert... It depends on the breeder you buy from. Some handle their snakes and so the snakes are beautiful and gentle... Others do not and the snakes can be bitey and more aggro. Some will tell you BHP's are hissy and grumpy, I have not found this to be the case with mine.
Mine eats every 7 days... I don't know exactly how big she was when I got her, but the breeder advertised her as 2-3 feet long, she is now 1.2 metres long... A month later. I am told it depends on the size of your enclosure.
I was told a constant 30' if they are under a year old.... My girl is about to go off temps now, as she is over that first year. I was also told you only winter them IF you are going to breed them.
You do not need the big elaborate set-up, I believe that a Red-spot globe gives enough heat here. I also believe they do need things to exercise on- some will tell you not to allow them to climb... My next BHP enclosure would be more than 500mm (20") high, to allow a BHP to climb a bit more if they wanted. I believe that if my snake can do what she does in her cage then she is quite agile.
To be honest, after you have them a month you will understand all I am saying... Each Snake has it's own querks!! I hope there was something in this that helped you out.