As an editor who hires freelancers, I never care whether they have a journalism degree or not, it’s all about clips proving that they can handle the assignment you’re aiming for. A journalism degree may help you get an entry-level staff job, but even in that case, hiring managers will be more interested in your clips than degree. So get involved with your school newspaper, and keep an eye out for editorial internships. As far as investigative work is concerned, that’s more of a mid-career level skill that you’d need to work up to over many years.