Being an ambush feeder your snake will love to strike at its food from within its hide. Another useful item is a piece of brick or builders block to give the snake a scratching post to help start off a shed. You may also want to add other bits of furniture such as a couple of plastic plants and a climbing branch. Substrate Substrate is a matter of preference, however with a new snake it is always best to start off with kitchen towel. This allows you to easily spot any external parasites that have dropped off onto the substrate.
Kitchen towel is absorbent, easy to replace and relatively cheap.
Once you are happy that your new snake is clean and parasite free you can think about another substrate. Bare in mind that if your snakes enclosure is difficult or time consuming to clean you will probably delay cleaning it. I would recommend sections of cord backed carpet, carpet tiles or Astroturf, cut to size. Once soiled these are replaced in seconds and a good overnight soak in disinfectant followed by a brush over make them easy to clean. Have at least 3 pieces available.