Personal note.. its nice to see another young reptile keeper posting here for information. And I cross my finger this young man doesn't go the same way as our loved MacAurther! (sp)
Anyways I to used to keeps Kingsnakes when I was about your age and I find the care or at least the setup very similar.
--Setup--
Both prefer arrid climates with a humid hide from time to time to help with sheding. Although since I have a mating trip of Leos its always in their viv. Both Leo and King are to be kept at more or less the same temperature. Make sure you have a few hides at the warm and cool end as you do with snakes so they can regulate their body temps. I have housed both my leos and kings on a substance called coral sand. Its quite a course sand. I have never had any problems with impactation with leos in the years I have had them. I'm not saying it won't happen but that my view on the substrate thing.
--Feeding--
Feeding an leo requires a little more work than a Kingsnake due to the frequency of feeding. (2-3 times a week for adults) I fed mine Adults Locuts to start with and then moved over to Mealworms as they are easier to keep alive and tend to last longer.. and are easier to handle etc. Dust the insects with a calcium/vitamin powder. Also giving an adult leo a pinkey every so often will help with their calcium levels. Most kings eat prey with bones so they have a constant source of calcium although it never ever hurts to give them alittle more.
Water needs... same as the King fresh bowl full every other day or so.
--Lighting--
Leos are nocturnal so they do not need a UV light of any type but a normal light bulb to provide a day/night cycle would be great.. unless they are located in a room with a window.
--Heating--
an under tank heat mat would be best for a leo as they like belly heat. The hot end should be in the mid to high 80s while the cool should be in the mid 70s-80s. Mine spend most of their time at the cool end at about 70f during the day and then move about during the night.
This is the basics of keeping a leo I hope it helps some. This is an excellent care sheet for leopard geckos and covers more or less every aspect of their life cycle.
http://www.thegeckospot.com/behaviourindex.html
Keep us updated on how it going.
Regards Jil