Training isn't a something that you do for a short period of time and quit once your dog has started being obedient. Training needs to be an important part of your daily routine with your pit bull.
When it comes to training your dog, there are as many techniques out there as there are trainers. Talk to ten dog owners about how they train, and you will get ten different answers.
I always suggest that new owners avoid prong collars, not because they can't be effective at training, but because the techniques required to effectively use a prong collar on your dog isn't easy to learn. An inexperienced trainer runs the risk or over correcting and causing potential dog - trainer relationship problems by using a prong collar. I have never met a dog that didn't respond well to positive reinforcement training techniques. It may not be the fastest way to train a dog, but in my opinion it produces the best results both in the dogs attitude and his desire to learn new things.