Welcome to the forum!
Just a few quick things before I pass out (I just got off work haha) the tubs are great but you might want to get an appropriate sized one for the Bp that you get. Some snakes will feel uncomfortable with a lot of open space... I think it breaks down to 6qt for hatchlings and up to 300 grams, then
28qt should be good for most adult males, and 41qt females males over 2000 grams.
The uth should be fine by itself especially sense there isn't really a way to use it with a tub =( just make sure you have the uth hooked up to a thermostat or a rheostat to keep the temps correct and prevent it from burning your snake.
As far as hides go, if the tub is the right size then you might not need one. It just depends on individual the snake. I love my leopard gecko's humid hide but the tubs usually do an really good job of holding humidity =P
I'm sure someone will be along that will be able to answer the rest of your questions soon and give more details =P