I want to become an actress or a musician, but i don't know how.?

I am an actress and this is how you do it. You need to either study music and acting or start writing songs and recording them, get a band together and gig, or go on as many auditions as possible. For Disney you cant walk in off the street, you need an agent. The performers at Disney have been acting since they were babies and you need a lot of experience, you need a resume. So try out for amateur theatre, commercials and so on. Try sending a head shot and your resume to agents and see if they will take you but you need a lot of professional experience, so get yourself into acting a music school while you are young. If you do in five years when your 18 you will have a great resume and you will make connections at school. Also sign up to starnow.com.au and see if you can get auditions.