Lizard habitat

Question

Lizard cage   My old leopard gecko died. So i got a new one and all i have in his tank is him of course A hide, A fake cactus, cage carpet and a water bowl. is this enough for him?

Answer
My first advice would be to completely disinfect the old tank, and any old cage furniture, using a 10% bleach solution left on for 5 minutes, and then rinsed off carefully until no bleach smell remains.

Leopard geckos have an estimated lifespan of 20 to 30 years, so unless your gecko was extremely elderly when you got it, it must have died of an illness of some kind.  The old cage furnishings and cage would carry the pathogen or parasite that killed the other gecko, so could transmit it to the new one.  If your other gecko was diagnosed by a vet as having something that isn't transmittable (such as cancer), then it would be less of a risk.

Now, for your setup:
Leopard geckos require a 20 gallon long-sized tank (for adults), an undertank heater controlled by a rheostat or thermostat to produce a 90F basking temperature on the cage floor over the mat, a dry hide, a humid hide (filled with damp sphagnum moss or paper towel, changed at least twice a week), and a water dish.  The cage carpet is fine, so long as it isn't the one used by the previous gecko.
Leopard geckos do need a humid hide, which helps them stay hydrated and shed their skin completely, so that's the only thing your setup is missing.  (You did not mention the heat source, but I assume you have one, as no one generally tries to keep a desert reptile without heat--but as pet stores rarely mention it, it may be that you don't have a controlling device for the heat pad, so you will need one of those).

You can get an indoor/outdoor thermometer with a remote probe at walmart for $10 or less.  This will allow you to accurately check the temperature of the cage floor over the heat, to make sure that it isn't too hot (reptiles sense heat with their belly and feet very poorly, so can be severely burned by heating devices that get too hot).

The heat pad should be shut off at night, as a cooling period is good for desert reptiles.