Hi i am looking into starting a rodent breeding business. Where i live there is the big name pet stores that will sell a large rat for 10 bucks, and a weaned mouse cost 2.50. I have 6 ball pythons and 4 corns and a red tail. So it is getting expensive to feed them all. My friends and roommates have reptiles too and they would buy from me. I will have a 10 by 20 work space to work in.

So my questions are:
1) how much on average does it cost per rat to raise it from a pinkie to large?(a guess works)
2)How many males and females do i need to have around 20 pinkies a week?
3)How much time do you think i will spend up keep the colony a week?
4)What prices should i sell them at?
5) Any other advice you can give to a noob?

Thanks