start figuring out your career. engineering, IT, healthcare, business, sales, logistics, or even military.
while in high school, talk to a counselor about career options. you should take a test at some point about your interests, aptitudes, and other areas for work. see what elective classes are available to peek your interest.
your high school may have classes for general life skills too. finances, taxes, time management, or other basic skills. again, ask a counselor.
figure out if you even want to go to college. where you want to go. what to study. or if you want to join the military (they have jobs that aren't combat or infantry related, and plenty can find similar work back in the civilian world). you can serve enlisted for four years after high school, and either get a job afterwards, or use the GI Bill to help pay for higher education. look online for more info. some high schools often have job fairs, and recruiters often attend. again, ask a counselor if such happens for info.
maybe take an auto shop class. just to familiarize your self with a car. basic repairs. how thing work, what to look for, etc. oil changes, tire changes, flat tires, jump starting a car, buying a used car, car insurance, etc.
learning teamwork in general is vital for school and companies. being able to listen, take directions, constructive criticism to improve your self is also important. maybe take a public speaking or speech class. they help you get ready to talk in front of others, listen to others, and develop critical thinking.
it's possible you can get entry level internships while in high school if you don't want to go to college right away, or the military. this would take place in the summer, and even if they aren't paid, the work experience is what companies look for to hire valuable candidates. though to advance higher in a company will likely require a degree eventually. and some companies do offer tuition reimbursement for employees to take advantage of.