
Sussex are a difficult breed to breed (known for low Libido) and there are very few pups born each year. I would contact the breed club and get on a waiting list with a breeder, now.
If you join the breed club you will be snet literature like year books where breeders will feature their dogs and show records.
If you go on the Kennel Club Website yu should be able to get the contact details when you view the Sussex breed standard page.