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Send a PM to Billy Nelson on here as he is a top trainer and would have been in your position when he started. You will get a good insight into the career path without any bull****. Other than that start your own classes at community centres etc, build your own reputation and one day you may open your own gym.
If you're after working with boxers they would be more interested in a Strength and Conditioner rather than a PT. Good luck though
however if you went down the white collar route if you tried at a later date to do pro boxing the area boards don't look upon it kindly doing wc