If you want to produce the best puppies in Massachusetts I highly recommend having your dog evaluated and championed. Not all dogs are breed worthy
Some recommended reading are books from Myra Savant Harris.
Myra Savant Harris
Also Pat Hastings.
Pat and Bob Hasting, Dogfolf Enterprises, Inc.
These two ladies also offer seminars
Debbie Jensen has good information also.
Dog Breeding and Canine Reproduction by Debbie Jensen. Dog Breeding and Whelping guide for dog breeders.