How do I be anonymous in Instagram so noone from my school can find me

I recently started a page to spread rumors about my school, (cause mostly out of boredom) just a rumors page nothing too crazy and I was wondering how I stay anonymous so that no one can find me from that school or have anything trace back to me? I've created a completely new identity to avoid spilling anything, so is any other steps I need to take to avoid anything combing back anything to me