♪♫♪♫♪♫How Can I start an Orchestra at my High school?♪♫♪♫?

Talk to your homeroom teacher or the principal and tell them what you have in mind. Most extracurricular clubs start with a student willing to put in the time and effort to get it going. Get the official blessing from whoever is in charge of those things and you can put out an announcement looking for other interested students.