When my taffy got pregnant I knew nothing about breeding, or whelping, since we were told that she was fixed when we adopted her from the rescue, I found a lot of valuable information at Debbie Jensen's site.. also I asked a breeder that I met thru my son to be my mentor he happend to live close to me, so I went and witness one of his beagle girl whelped and learned a lot..
here's the link to Debbie's site..
Debbie Jensen Dog Breeding and Canine Reproduction by Debbie Jensen. Dog Breeding and Whelping guide for dog breeders.
another site that helped a lot was
Whelping Supplies