Catahoulas work better as a team. If you are starting them from scratch, you will do better with two or three dogs. I use three whenever possible. How each individual dog works depends on a lot of things. A good dog with a bad handler is more than likely not to come up to its full potential.
Some dogs become good stock dogs in spite of the handler.
It is not my intention to write about how to train, but to give a few pointers on what is needed to have dogs that will help and not hinder. There are a multitude of books and videos on training of dogs. The first, and I believe the most important thing when training is to have the dog understand what is expected of it. A dog that does not know what it is supposed to do will be confused. One that knows, but does not do is disobedient.