It seems you're quite confident of your choice, so I'll add up some advice for you.
Well, Study the Lives of the people top in your industry(i.e Rapping for you). How did they begin their career? Did they have a formal education? Or Did they learn on their own? What sacrifices did they make? Did they find the right balance between their work and life? If Yes, How?
Study deeply your idols. Learn from them. Research thoroughly about the whole process and the future of your career viz. the path. It will turn out to be a great inspiration as you learn more and more. And do check twice if you're investing the money in a right way for doing a thing(i.e Rapping in your case).
Good Luck!
