One-Stop Career Centers are regional service organizations that help you assess your skills, explore your career options, and apply for apprenticeships and jobs. These centers are all over the United States. Contact your local One-Stop Career Center and ask them how they can link you to trainings and opportunities for green-collar jobs. This website lets you search One-Stop Career Centers by location: http://www.servicelocator.org
When choosing a training program, it is important to find one that is connected to employment opportunities and is not too expensive. The most important thing is getting steady work once you complete your program.