http://www.weimaraner-association.org.uk/If you would like to know more about the breed you could apply to the secretary of the WA for the Introduction to the Weimaraner which will give you a good background on the breed.
One of the committee can put you in touch with an experienced weimaraner owner in your area for a chat and visit.
It is important to research your breeder extremely carefully to ensure that they abide either by the codes of conduct/ethics of the WA or the Weimaraner Club of Great Britain in order to safeguard a) the breed and b) you.
As an overview members agree not to mate a bitch under two years of age, not to allow more than one litter every twelve months and for a bitch to have no more than 3 litters in her lifetime.
Members should only breed from stock that meets the breed standard both in physique and temperament and hunting ability and recommend that members take advantage of the relevant health checks is hip scoring. The breed average is 13. Reputable breeders will hip score their breeding stock to optimise the health of planned litters.
If you go to view a litter the breeder will be able to show you the Hip Score certificate of the dam and a copy of one from the sire.
I hope that helps.