how can i become a breeder

Why do you want to become a breeder? :-)

I am assuming you mean someon worthy of the title. :D

First of all are you prepared for the responsibilities to the individual pups, their owners and the breed.  You are morally responsible for the pups you breed for the whole of their lives and should be willing to take back or make provision to home any that need rehoming.  You should also be available to the new owners to help them with training and any other problems they may encounter.

You need to bear in mind that to breed responsibley and properly you are very likely to be quite out of pocket,a nd breeding should be viewed as a hobby, and passion for your breed.

You choose your breed by researching.  This can be done through books, internet etc (to get a shortlist) then attend some shows to meet the dogs you are interested in in the flesh.

When you have your breed further study should show you which breeders stock you find most pelasing within the broad constrainst of teh breed standard.  Make your interest and enthusiasm known to the breeders whose stock you most like and ask to go on a waiting list for a show/working potential puppy.

If your pup lives up to it's promise has done well at shows and/or in the working field (mainly applies to Gundogs that tend to have a different working type) then have your bitch health tested.  Usually Hip Scored and Eye tested, possibly elbow, hearing, Blood tested etc, all depending on breed.

If these results are good then you will start searcvhing for the perfect partner.  You will be looking at dogs that are produceing the kind of pups you hope to produce, take notice especially if the bitches are of similar breeding to yours.  When you have a shortlist of potential sires who are strong in your bitches less good points, but are still good in ehr best points then contact teh males owners to see if your bitch is acceptable to them.

Then the fun, hard work, and sadly sometimes heartbreak really begin.