Are you getting the snakes from someone local who could assist you with a proper setup for them? If not, most areas have good reptile clubs, you could look for one and join it, and have access to lots of local reptile lovers who can assist you in doing your setup. I recently befriended a first time snake owner and went to her house to help her get her setup correct, then had her to my house so she could get experience feeding my collection before attempting to feed her new boy as she'd never fed a snake before so wasn't sure how. It's nice to have the forums to ask questions and get answers, but so much better if you can find someone local who can actually come in and see your setup and help get you going on the right foot. For instance, I have no idea what you mean by heat pads, and as the other poster mentioned, we don't know what kind of thermostat you are using. So we have limited info to be able to offer suggestions from. Do your best to set up individual enclosures for the snakes. If you can't afford a rack (which would be the ideal option if you can swing it) then you can check your local classifieds, or craigs list, to see if anyone is selling used tanks, you can get some good deals that way. Best of luck to you and welcome to the world of snake keeping!
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Slytherin Serpents
Have you been hugged by your snake today? 
Ball Pythons
1.1 Het Caramels (Edward & Bella)
0.1 Normal 66% ph Caramel (Rosalie)
0.1 Caramel (Bellatrix)
1.0 Honey Bee (Aragog)
0.1 Hypo Pastel (Nagini)
0.1 Spider 66% ph Hypo(Nymphadora)
1.1 Mojaves (Lucius & Renesme)
1.1 Pastel Lessers (Jacob & Narcissa)
0.1 Pinstripe (Arwen)
1.0 Pewter (Salazar)
0.1 Bumble Bee (Alice)
0.1 Lemonblast (Luna)
1.0 Bell Pastel (Jasper)
0.1 African Dinker (Esme)
0.1 Normal (Madame Olympe Maxime)
0.1 Het Pied
1.1 Pastel Dinkers (Snape & Xiomara)
0.2 Ghana Dinker Babies
Corns
1.1 Normals het Amel, Anery, Charcoal, Diffused, Hypo (Romeo & Juliet)
1.0 Blizzard het Diffused (Tumnus)
1.0 Blizzard poss het Anery, Hypo, Diffused (Cotton)
0.1 Anery Lavender het Amel (Lucy)
0.1 Plasma poss het Hypo (Victoria)
1.0 Plasma poss het Albino
1.0 Hypo Plasma
0.1 Opal (Jewel)
1.1 Amel Motleys (Harry & Ginny)
0.1 Lavender Motley poss het diffused
1.0 Lavender Pinstripe Motley het Amel
0.1 Fire poss het Anery, Charcoal, Hypo (LeeLoo)
0.1 Normal het Albino, Lavender, Anery, Charcoal, poss het Diffused
1.0 Albino het Lavender, Anery, Charcoal, poss het Diffused
1.1 Sunkissed poss het Plasma (Arthur & Molly)
0.1 Dilute Blue Motley
1.0 Pastel Motley
Kings
0.1 Thayeri - Leonis (Sidney)
1.0 Thayeri - MSP
1.1 Red Hypo Brooks