When should a puppy start training classes | Is dog training a good career

Those that stay long enough at the club may first go on to attend and ‘compete’ in those Exemption Shows that have Obedience Classes. For the majority of Exemption Shows you just ‘show up’ and enter a Class on the day, for which you pay a nominal entrance fee, which generally goes to charity or the clubs funds (note that most DTCs are non-profit making).
A training class is not there to train your dog. Its purpose is to teach you to train your dog so you will need to be committed to train your dog for short sessions (5 minutes) several times a day rather than just simply turn up for classes! This little bit of training everyday will be repaid with a lifetime of living with a well behaved dog. You will also learn to avoid problems before they begin as well as receive help to overcome any that you already have with your dog.