You've got it down pretty good, but I wouldn't expect diversion (teen court). You will probably go to juve court. If you do, ask for diversion. All they can say is no. The worst that will happen is you'll be adjudicated and put on probation. You could also just get a judicial repremand.
If you do go to adult court, you should be able to get diversion.
You need an attorney. You have a lot at stake.
Mr. Waggoner was absolutely correct in saying that you contact a local attorney, rather than try to handle this alone. You have too much at stake.
You may qualify for diversion which, if you complete successfully, will result in the dismissal of your charges. However, given your priors, you may not. It's unlikely that you will be charged as an adult, but that doesn't make your situation less serious. While both the judge and the prosecutor would likely take into account your your good performance at school, it is not the only factor that they will consider. You should have an attorney to guide you through the process to help ensure that you end up with the best possible outcome. Good Luck!