Oh MAN I love cresties. I miss mine like crazy and will have another someday. So easy to care for, and pretty easy/fun to handle if they're handles gently from juvies. Mine loved to hand-climb. Also, they change colours. That's always an awesome thing.
They're usually pretty well-lived, though their actual lifespans are still being determined. Mine passed at 2ish years old from whoknowswhat.
Mostly echoing what other have said: Exo-terras are awesome. You need the tall one with at least an 18x18 base for an adult, juvies do fine in a 12x12 base tall enclosure. There are so many ways to do up their habitat. I did a live growth viv that did very well, but later switched to artficial for convenience. Diet is easy: The powdered CGD is all they need, but I suggest periodic crickets for variety and for hunting.
I never did waxworms, but some do as treats.
Also Blackrose, the pic you posted is of a leachie I'm pretty sure, not a garg! Leachies are a rhacodactylus gecko as well, but they grow quite a bit larger.
Geckoforums.net are generally quite helpful. They focus on leos but have an active rhac section of the forum as well!
And because threads are useless without photos and I'm feeling nostalgic...
Enclosure, plants were all live except that top one. The pothos grew all around the tank within a few months.
I love this pic. It shows the cool teethlike ridge along their jaw for gripping insects. And her forked tongue, little dragon.
Eating her CGD.
And some of her colour variations...
This was her most "common" colour.
Feeling green.
Completely grey. This happened pretty rarely.
Another one of the grey.
When she was most active, she would fire up to a bold brownish-maroon.
I highly recommend cresties.
Get one! Between a leo and a crestie, I'd suggest crestie all the way.