Newbie wanting Horsefield advice

[Sparklestarkey]

Hey everyone.
My name is Laura and last night I re-homed a 4 year old female Horsefield. She is in an open top enclosure with a soil Mix substrate. She has a few rocks, a basking slate and a hide. There is also a water bowl, a heat bulb and a UV bulb.
The bulbs are placed next to each other so should I separate them? Have one one end and one the other? Also, what are the correct temps?
I had a spur thigh a few years ago that unfortunately had to be out to sleep and I'm a bit rusty.
I'm going out today to buy more substrate because she hasn't got enough to dig down in, I read that children's play sand is ok too? I've bought a few large pebble things to try to create some different flooring later on.
I gave her a warm bath this morning because she was filthy and she is currently circling her enclosure and trampling and weeing over her food.
Any advice you could give would be very much appreciated! X