I dont have any crested but i have lots of leachies and they are housed the same way.

Get a long fish tank like maybe a 30 gallon and stand it on on its end. These geckos like to live in trees and tall plants so they like the height.
Substrate is up to you. I have some cages with Dirt from my back yard and some with newspaper. The dirt looks nice and hold humidity way better. Keep it moist and toss in a few earth worms and leaves to keep a nice cycle going.
If you calk on a slamm piece of plexiglass on the inside bottom you can fill it with dirt easier.
Lots of sticks going up and down and lots of plastic plants to hide in close to the top of the cage. Try to make a nest out of plants in the top corner. Get the plastic plants from a large hobby store not a pet store. Better quality and cheaper.
Feeding is simple. Allen Repashy designed a crested geco diet that is awesome. Just mix it with water so it looks like thick soup and thats it.
Crested geckos are very photogenic and love being in pictures. You dont need any heat lamps inless it gets colder then 70 degrees. I heep a space heater in my basement and its a constant 75.
Crested are super easy to take care uf. Just feed them and mist them a couple times a day to keep it humid. And they normally drink the water off the glass walls of the cage.