[superheel]

Take as many acting/singing classes as you can. Then go to auditions, and you also need a talent agency. Start small, like join community theatres, act in plays and musicals. Nobody starts big, you have to work your ass off to be popular. YouTube is another place, do vlogs or maybe do song covers. If you are fluent in Japanese, then great. You know that Magibon chick on YouTube? She became a star just by staring on her camera and speaking some few japanese phrases. She even guested on Japanese TV shows. There's alot of way to be star, but you have to do alot of homeworks.