Well, for an adult, you will want the basking spot temp to be around 50-60c, you will want to use 2-3 down lights in a row, to cover the monitors torso. If you only have 1 small hot spot, the monitor will have to constantly re-adjust itself to warm its body properly, having a longer basking spot, means the monitor can simply lay still and evenly warm it's body. And since your monitor is injured, this will take a little strain off it.
You will also want to have a deep, moisture holding substrate (between 100-200mm deep). I use a mixture of "kritters crumble" fine and corse. You can also use leaf litter and coco-peat from bunnings.
Lacies need humidity and will dig and burry themselves in the substrate to get extra humidity. It also entertains them.
Just because this Lacie has a head injury, don't expect that it's going to remain calm and inactive. Although there is a chance it could have perminant brain damage (I'm assuming it was hit by a car), which in that case, it could remain "calm" and inactive. More then likely though, it will recover to the point of getting its typical Lacie attitude back.
Lacies can cause some surious damage to you and easily hospitalize you, once it starts picking up, you will need to be more and more careful around it. No fast movements and wash your hands with soap before interacting with it (if you have a scent on your hands that it likes, it could set off a feeding response, and you don't want to be in the way when that happens). Also, watch its eyes very closely when interacting, if they suddenly dilate, get out of there, this is a sign of a feeding response.
It may not eat for a while, but when it does, you will need to be feeding whole bodied small animals (rats, mice, birds, etc). Do not feed a meat only diet, lacies need the vitimins from the animals organs, which it can't get from meat alone.
Good luck with it, you'll have your hands full
