Union apprenticeship sign-ups near Albuquerque - any advice?

I heard of an apprenticeship with paid on-the-job training for people changing careers. There are 9 people counting on me, so I am trying to be careful. The application needs a diploma or equivalent, a driver's licence and a short aptitude test. What do you wish you had known?

Bring your transcripts and any proof of work history. They asked for both in the interview.