I've got a 3'x2'x2' wooden viv, with glass doors.
I use a 30 watt heat mat attached to 1 side of the viv, in winter the heat mat is on constantly and the temp is controlled by a dimmer thermostat on a red night light, this provides the extra heat required.
In the summer I don't use the lamp and use the thermostat on the heat mat.
The viv should have a temperature gradient of approx 82* f in the hot end to 78* f in the cool end. provide a basking spot of 86* f max.
Lower the temp at night to 76*f to 78*f.
Humidity should remain at approx 50% all year round.
Use dark, damp bark substrate, a hide box and maybe a log, as they do sometimes like to climb. I also use damp moss to provide humidity.
Provide a large water bowl, preferably large enough for the royal to lie in.
Most importantly provide lots of love and care!