Book a one-on-one Amature session with each gym you are concidering. Once you find the vibe from the trainers, other members and surroundings that you agree with, then stay at that one. I love my boxing club. No stress, no worries, no B/S.. Just boxing and plenty of laughs.
Once you book for an Amature session, they will determin your skill level and fitness level, usually in the 1st training session. Go with an open mind to every session. Dont listen to the glam stories from the trainers and boxers there, You are there for your own self gains. Make your money count in every training session and approach evey trainer with the notion that they have a new mould to make. They love it.