Others will be sure to chime in, but reading Maryanna Dennard’s book “l Got in” is a terrific place to start. There are other courageous students who have done this on their own - @Parachuteboy rocked it this year and can probably share his insights. As can others, I’m sure. Do you have voice or drama teacher at school who is supportive? The first things you will need to do are find appropriate monologues and solos. You will also need to develop a range of schools that are a good fit for you and your family’s circumstances and find out which ones need prescreens. Talk to you HS counselor now and if he/she is unfamiliar with getting students into performing arts BFA/BA programs let him/her know that your application process will not be like the “regular” seniors. Talk to the people who will be writing your letters of rec now and let them know you will need your recommendations in September. If there is any way you can swing hiring one of the well-regarded national coaches for a few skype sessions, that might be money very well spent.