Frank,
Where to begin????
First, let me congratulate you on your rebuilt kohler.
I work for a defense contractor (Raytheon). I spend most days sitting in my cube in front of the computer. I AM DILBERT!!!! Read the cartoon, it is very accurate (at least at large companies).
My previous job, I worked for a company that built ambulances. I traveled a bit more, actually interacted with several customers, & was on the production floor everyday. Downside? It was in New Jersey, I missed New England & my family.
Stress & travel depend on the project & the "project team" at a big company, sometimes you get farmed around and aren't doing work for your actual "boss" This can be a bad thing if the new boss is a jerk.
I like solving problems, I hate the red tape.
Salary varies by industry, economy & location. Contact your local university, they should be able to tell you starting salaries. If you are working in industry, typically a masters degree is your best bang for the buck, if you are in academics, PHD.
Check out <A target="_blank" HREF=http://www.asme.org>American Society of Mechanical Engineers</A>
Ask your guidance counselor about summer programs. I know its a little nerdy. but I did one (way back when) at <A target="_blank" HREF=http://www.rose-hulman.edu/> Rose-Hulman </A> for three weeks after my junior year in high school.
Sounds like you want to work at your own company? I'd suggest trying to get a job in the industry first & trying it out. The smaller the company you work for, the more you will be exposed to at an entry level (less layers of management). Ambulance company had 100 employees. I can't keep track of how many Raytheon has. They keep merging & spinning off etc divisions. Something like 40,000.