My friend purchased a WC sunbeam at a show and now after reading up on them realizes they are not a beginner snake. She has asked me to care for the sunbeam until she moves and can provide the proper care.

So I am asking for any advice on keeping this sunbeam alive and healthy. I read they like temps around 88 for the hot side and a humidity level of around 80%. She does not have contact info for the person she purchased her from so that is why I'm taking on her care. I've also read they like deep substrate. They purchased a bag of eco-earth for her. Anything else I should provide? She's in a 20 long tank.

Sorry if this is short and to the point but im typing from my phone at work. The sunbeam is coming to me on Thursday.