Are you planning on buying baby leopard geckos or adult ones? And also, I would reccomend using either slate or limo flooring untill your geckos reach adult size. Calcium sand is not really a good choice as a sand, nevermind a substrate. The risks of impaction that come with sand are some what less than people make out. As long as you use a fine grain sand, e.g Argos play sand (£3 for 15kilos) and feed slightly oversized crickets you should be fine providing you geckos have good calcium in their diet. Calcium sand actually makes the geckos want to eat it. Which is definitely not the way forward.
Also you will need a thermostat to control your temps!