I want to be a news reporter and an Mtv host but how?

I want to be a news reporter and an Mtv host but how?
okay I actually want to be both of those but Idk how like when i'm at school I don't know which course would be good to take and same goes to collage. I'm 15 and I want to know how can I become both of those things? And what grades am I suppose to get? I'm not a straight A person or a B I'm more a C+