Viper Geckos!

[Nubs]

Hi everyone! Thank you all so much for welcoming me here! I have a few viper gecko questions,so I hope you have answers! So,I will be going to a reptile expo for my birthday this year,and I will hopefully be allowed to pick out my choice lizard,(within reason of course!)and I would like a couple Viper Geckos! I would like to start a small breeding project with them,so I will probably get 2-3 females and 1 male! Here are the questions! What is the best substrate? How big should the tank be for 2-3 females? How big should the tank be for one male? Can the male live with the females permanently or is it best to keep them mostly seperate? Temperature? Heat source? Incubation? Can males live together?(I've heard mixed in this) You can handle them,right? What size enclosure for babies? Should I keep all babies separated or together? Humidity? What would I need overall in their setup? Important! How much do they cost apiece? I'm no newb,but I can't find detailed care on these guys!