Here is an estimated list:
three slot adult rack for breeder size animals - $380
nine slot baby rack - $250
ten slot grow up rack $400
incubator $400
thermostats - $120 per figure on at least three
ten slot adult rack - $600 - $900
rats to feed everyone - $30 pr/wk
bedding $50 pr/mt
You won't need everything at once but if babies don't sell,
or any number of things occur and you have them for a long
period of time some of these other expenses will kick in.
This is by no means a complete list add cleaning supplys, vet care and more.
I have seen too many people get in over their heads and then the animals suffer.
Be prepared and be realistic.