The first step is to check with your Dept. of Labor - their might be a State office as well as the Federal one - to learn what approved apprenticeship programs exist in your area. There is very likely to be both a JATC ("union") and NCCER ("non-union") program in your area.
Contact each and learn what their application rules are. Then do what you can to get things started. Once 'in the system,' keep at it; it will likely take multiple interviews and several years to be formally accepted into any apprenticeship program.
In the meantime, it's possible that there is a trade school or community college that offers relevant courses and programs - for example, in 'industrial maintenance.' These will be of far more immediate value in finding work even remotely related to electrician work.
It can also be in your interest to seek employment in other construction trades. The ability to patch walls, match textures, finish concrete, simple framing, roofing repair, operate a backhoe ... all will later come in handy, especially in a non-union environment.
Likewise, many industrial employers want other skills in addition to electrical; electronic or instrumentation degrees, HVAC certification, welding, etc. It's in your interests to develop these skills.
Remember that being an 'electrician' is a CONSTRUCTION trade, and a SKILLED trade. That means that work is irregular, seasonal, and involves changing employers often. That means you need time and practice to master it; you can't get it by reading books and passing tests.
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