OMG, no idea what to expect?????? Have you not been doing your homework???
Here you go, better start reading
Canine Reproduction Video and Book on Breeding and Whelping dogs by Debbie Jensen for dog breeders and Whelping Supplies needed to deliver puppies.
This is my favorite website on everything from breeding, pregnancy, whelping, and weaning the puppies. Click on the links on either side of the page for a wealth of information on it all. Good luck to you. Keep us posted, there are many here who will be willing to help when the time comes.