Answers to your questions will be posted as soon as they are received. I have been with the same firm for almost 20 years and I need a change. I would prefer to list myself with an agency and not use the classified ads, but I'm not sure what type of agency I need.
Recruiters are a good resource for people with experience in a sought after field.
Find recruiters that don't charge you a fee but charge the companies that are looking for employees. To find recruiters in your field I would look in professional trade publications or in the phone book. You can also go online. The best way to get another job is by creating a network of people that you can share resources with. This allows you to know about jobs that aren't known by the general public and have an inside track applying for them.