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What kind of engineering should I study?

I graduated with a degree in Art 6 years ago. Now I’m a dissatisfied Dental Lab Technician. I’m good at math and I like to play around with machines and wood and wires and anything I can get my hands on. I want to make alternative energy sources that people will actually use. That (to me) says R&D mechanical (not as into the chemical), but I don’t know any engineers. What kind of engineering should I focus on? What kind of classes should I take at my local college to get into grad school? Are there good online schools so I can still live and work normally?

Your first year or two will have basic courses that apply to all engineering. You will get a little exposure to all types of engineering. That will give you some idea of what you might like.
There are many on line schools. I am not sure which ones really are good but a few web searches should help you out. Look for “on;one” “college” “engineer” or engineering” and see what pops up.
Look for local professional societies.
try searching for “professional” “society” “engineer”

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