For someone getting ready to decide on what to do after high school, this is an important question to ask. You would think that in this day and age to be successful you have to go to college. This is far from the truth.
I can think of a few professional jobs that don't require a college degree and can net you a good income. Many manufacturing and laboratory supervisory positions do not require a college degree. You may need to attend some seminars, or take some courses during your career, but you can definitely get your start fresh out of high school.
Plumbers and electricians also make very good money, and you can become one with only an apprenticeship. You will be required to take specific courses, but you are also getting paid while you train.
In some states you can also work towards your LNA/CNA certificate while working and getting paid. Nursing homes and care facilities will often pay for the training while you are employed with them as long as you sign a contract for a certain period of time.