Please don't become another backyard breeder. You have already supported an irresponsible breeder, but buying puppies from her, now you are considering becoming one yourself? Please go spend some time at an animal shelter, go meet the dogs whose time is running out. The last thing this world needs is more dogs/puppies. The only time dogs should be bred is to advance the breed, read/reread Shaz's post.
Your dogs deserve your love and respect, get them spayed and neutered and enjoy them as PETS, not as your income!