Cresties are simple to care for. They don't require heat and or lights. Room temp is fine for them, most people incubate their eggs at room temp as well. As for substrate, you can use anything you would keep a snake on. I have some on aspen, some on paper towels both work fine as well. In my bigger tank i have aspen covering a couple of inches then i take a lot of plastic plants or flowers and pack them in there. Cresties love to climb and hide out in the plants, plus it gives them cover and they feel safer.
I will warn you cresties are very addictive, you can't just stop at one or two...
oh where are you getting yours from?