Higher Education (Help PLEASE!)

join the marines, unless you have shooting skills then join the coast guard

So I've come to the point where I've decided I need to make a major career change... But I really don't know what to do!
So lets cover the basic questions I know would be coming. I will soon be taking the SAT/ACT placement tests to see what universities I would qualify for Financial Aide at.

1) My Favorite, best subjects in school were

a)ANYTHING Math.
b)ANYTHING Science

2) I could stand working outdoors, OR in an office.

3) I Graduated Highschool with roughly a 3.0 GPA (regretfully, I didn't used to see the value in applying myself completely)

4) I went straight into the workforce with no education past high school.

So, I guess what I'm asking is- What's out there? If you need any more information I'll gladly answer your questions!

Thanks!
 
Some sort of trade school, low time investment with a hopefully high monetary return for time invested, it's all about the hands on experience.