Switch to a Under Tank Heater for BP's. This should be attached to a good thermostat like a Herpstat. Those are costly, but worth it.
Next step would be to change to something better than a glass aquarium. They can work for BPs, but require modification's to help hold humidity as well as heat. Personally since you only have one, just a normal plastic tub would work like this one
Substrate wither use the cocoa fiber from pet stores, or use 100% pure cypress mulch. I preferred the cypress, but needs to be 100% cypress. Not a blend.
As far as furnishings, atleast 2 hides, one above the heat source and one on the cool side. 1 water bowl and thats all you need. More isn't bad, but not needed.
Hot side should be no hotter than about 95F, no cooler than around 87F. I kept mine at 91F. Humidity 55% or so, which is easy to do in the plastic tubs.
BP's are almost always hiding. Its normal behavior. They are also nocturnal.
As far as the feeding goes, it would depend on the size. If you have a kitchen scale, get the weigh in grams and update us. As well as a picture would be helpful.
For feeding sources, the way I found mine was through Facebook groups in my area. May check that out. Google lead me to The Brass Gecko
To find more just search "feeder rodents" and add in your city or others near you.