Call the union office & local colleges would be a start.
There are a few questions that you may want to ask yourself before you head into the trades.
Do you enjoy working with others (often rude mannerism), physical work, dirty/loud environment, travel, willing to move, and type of work?
Give the local trade business that you are interested in a call, and ask them what are their day to day tasks in the field; to have a clearer picture of what to expect in that trade.
Top of the list for me would be, instrumentation/control mechanic, aviation mechanic, refrigeration/HVAC mechanic, elevator mechanic, power engineer/powerline tech, electrician, pipe/steam fitter, plumber, tool & die maker.
Your welcome.