Making a background is not that hard
So I would recommend you to buy some cork pieces https://www.pangeareptile.com/store/...-for-sale.html or pick some up if you go to a show, some can be used for bacground and some for your crestie to rest on.
After that soil substrate and drainage you will need
Clay pebbles https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Weed barrier https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Top Soil
Sand
Leaf litter https://www.pangeareptile.com/store/...litter-en.html
Live plant such as Pothos
Clean up crew