Read as much as you can on these bbs BEFORE you buy your leo! It'll save you a ton of trouble, worry & money. Start in the housing forum & spend some time checking out the photos of set ups in the gallery.
Needs: uth, water & food dishes, calcium, food of choice (crickets, mealies) & their food/moisture supply, a minimum of a 10 gallon tank (20g is real nice for 1)--go long, not tall as leos don't climb, moist hide & other rock/bucket like features for hiding, a herp vet for a fecal & wellness check, cage dissinfectant, thermostat or heat gun...there's more but that's the basics.
Marcia of GoldenGateGeckos has an excellent care sheet on her website. This includes a list of items needed for an enclosure set-up AND enclosure supplies.