It depends on what you would like to do as well as your background. Many fields have entry level jobs for those just starting out or with not much experience. I say go for it! You might start by volunteering and showing you're responsible can lead to a job that way. That's great you have that ambition now! Good luck!
depends what job you want, Brain surgeon? gonna have to have a degree, and experience, burger flipper at McDonalds? shouldnt need anything except showing up to work