well first you have to make sure you LOVE acting and not just wanna get famous, be very honest with yourself it important because acting is unreliable and only 1% of people who want to be actors actually get to do it for a living. if u still really want to do it then start now cuz its getting too late till u finish school, do plays at school and find after school acting activities and by the time you leave high school you will have some experience. here is a list of acting schools.