Hey but one thing man if ur new to geckos buy one first and not 4 because ull see its quite a bit of work. see if u like it see if ur ready. Cause its a lot of work and do u have enough money to feed 4? cause itll cost u about 10 bucks a week. Which is a lot! So get one first ok man? And ull probabley need more then one enclusure I would get one 15 gallon or 10 for the male and the 40 for the females. Always leave the male with the females but make shure he doesnt strees them and pic on them if he does seperate them ok? and ur geckos also have to be big enough to breed so buy them and keep the girls in 40 gallon and guy in 10-15 gallon seperate for like 6 mounths or so until there big enough old enogh heavy enough I would recomend about 50 grams for the girl/s and about (minimum 40 grams for guy/s) ok? soo u have to think about it oh yah and dont use sand as a substrate use paper towel/newspaper ok and leave about one hide for each gecko + about 2 for extra with one tuperware with a hole in cover and/or side sith most vermiculite of sphagnum moss or even damp paper towels. its a lot of work and also do u have an incubator for eggs> if u dont heres a link to a plan for one.
http://members.aol.com/TheWyvernsLair/incubator.html I would recomend the second one in the page first one is cheap. So I hope this helped u cause it took me a while to write oh yah and also read this care sheet.
http://www.leopardgecko.com/emcare.html Well good luck with it! And think about it!