i am not a breeder, but i have a 3 year old dog i would like to put out to stud.could somebody give me some advice or contacts please.

Best advice is to contact the breed club, get a breed expert to assess him to learn whether he is breeding material or purely pet quality, and find out what health checks are required (to minimise the possibility of being sued if he passes on avoidable hereditary conditions). When he has received satisfactory results from these, you wait for bitch owners to approach you. The way they find out about his availability is generally to exhibit him.

Do we know the breed, some breeds have more than enough quality studs already whilst others would welcome a new stud providing he is of breeding quality.