as Dave said, the rehab program is there to help you. It encompasses health, psychosocial and vocational elements all to assist you in achieving your goals that you identify with your case manager (i.e.: employment, treatments for xyz, and education / skills).
Don't sweat the school stuff, your rehab plan comes first. You will decide when it is time to look at the vocational stuff. Think of your case manager as a partner. Together you will decide what type of treatment you wish to seek, set goals, and allow the rehab plan to evolve when you're ready.
Unfortunately, you may have some time to wait for a case manager to be assigned to you, just continue to focus on your health. If you have a specific question or questions in general about the program call the VAC number or email them and request the contact information for a duty case manager in your region.
We're proud of you for serving and you're entitled to this benefit regardless of what you did in your military career.