
Hi Talizman, welcome to the Forum! :)
The sire's hip-score is very good - you are correct in thinking it should be quoted as two numbers, one for each hip, but the scores are often added together - so the sire could be 0:4, 1:3, or 2:2. All of those are excellent.
The mother should be hip-scored too, so that is a bit of a black mark against the breeder.
Documentation: with the pup you wouldbe given a minimum of a pedigree (written or printed) of at least 3 generations, the Kennel Club Registration Certificate, and a copy of the Kennel Club General Code of Ethics. A good breeder will also give you a diet sheet, care instructions, the tattoo/microchip registration form (if done), details of any veterinary treatment (worming etc) and a Sales Agreement.
Ages for breeding: there are no minimum or maximum ages for breeding for males, but the Kennel Club will not register pups from a bitch younger than 12 months (most breed clubs frown upon the mating of a bitch under 2 years) or older than 8 years.
Hope this helps.
:)