as for the first topic about temps: I use two infrared bulbs one 100w 24/7 for ambient, and an 150w for basking, no uth, and I am going to get a thermostat or dimmer for it.
Substrate: I am currently using aspen which is not so good at keeping humidity, but next cleaning I will use eco earth and other dark beddings (I know not to use cedar or pine)
humidity: keep a wet/damp towel above your tank on the screen to keep in humidity, mist it constantly, I am planning to get a misting system soon.