With the correct setup a leopard gecko is an awesome pet to keep. Housing
As long as the tank is two feet in length it should be okay - height isn't a real issue since they're not great climbers. I started out with my leo in a spare 15 gallon fish tank and that was fine. I changed to a terrarium after a while though as I didn't like only having access through the top of the tank, it's much easier with sliding glass doors at the front.
Heating and Lighting
In terms of heat and lighting, I started out with a heat mat covering just over a third of the tank, a heat lamp and a UV lamp. You'll get conflicing information as to whether a UV lamp is necessary - I think I've used mine twice since getting my leo (he hides as soon as it's switched on). I think it's too bright for him. As for the heat lamp, I haven't found it necessary to use - the heat mat is adequate. The only thing the light is good for is taking photographs of him.
Be sure to get a temperature regulator (you don't want to fry the little guy) - I use Habistat which has a sensor just above the floor.
As for substrate, I started out with the repile carpet but felt it was a little rough on the leos little feet so I took it out and now use thick paper instead. Using paper means it can be discarded and replaced on a regular basis. Don't use anything like sand as this can be ingested and cause the leo to become impacted. Feeding
As for feeding, the best choice of food is either crickets or mealworms (crickets are better if he'll take them). There are different things you can use to gutload the insects - I use a mixture of fruit, veg and also gut-loading dry food which I get from a reptile store. Supplements
There are a couple of different supplements I give to my leo. Firstly is cricket dust which I coat the food with on each feeding. Secondly , I keep a shallow dish of calcium powder in his tank at all times. I see him eating it fairly reguarly. I also use a product called Leopard Gecko Dust which contains a variety of nutrients, but I only use this once per week and give it by lightly dusting his food with it.
A water dish with daily fresh water is essential. Shedding
As for housing, you'll need to have a moist box in the tank to aid with shedding of his skin. Make sure it's fully enclosed to retain moisture. I used an old icecream tub with a hole cut out for a door. It has a couple of centimeters of spagnum moss on the bottom which is kept damp at all times. It needs replacing fairly regularly, and I've started buying blocks of dried moss which can be broken off as required - it's great stuff.
He'll usually shed his skin every couple of weeks or so. He'll eat his skin as he sheds so you don't need to worry about removing it. What you do need to watch out for is that he sheds properly - sometimes skin can be left behind on their little toes which you would need to remove. As long as he has the moistbox it shouldn't be too much of a problem though.
He'll also need a cave or some sort of enclosure to hide in. The moist box I keep on the warm end of the tank, the cave on the cooler end. Toilet
Leos are quite good with their toilet habits and tend to go in one chosen place which they'll stick to. One you know where that place is, you can put down a piece of kitchen towel and replace it every day. Leopard Gecko Morphs
There are loads of different morphs of leopard gecko available, so you should have a look around and see what kind you prefer. They change dramatically in appearance when they start to mature - you can see a dramatic change in Charlie in my Leopard Gecko thread http://www.fishforum.com/vivarium-po...rd-gecko-7348/
If I think of anything I've missed out I'll let you know and keep asking loads of questions.
Hope this helped