rats at my local petsmart cost $11.99 ea ($59.95 for rats for 1 month) so im probably gonna breed them myself when my bp reaches adulthood. but i have some q's.

1) will 1 male with 2 females be good?
2) can they stay together when babies are born or will the male kill them?
3) what are the signs that a female is pregnant?
4) what is their gestation period?
5) what is a good breeding schedule?
6) how long does a female rat nurse its babies?