Thanks for your tips, I have checked these sites and find them somewhat helpful.
Are their any engineering managers who manage between 3-5 Mechanical engineers willing to provide a salary range?
I have been with my current company for 3 years so I have the industry experience, but they want me to move to management, working for the Director of Engineering. I have a BSME, but no management course work completed, however I was director of Engineering in a former job managing 2 engineers.