So what are you going to do, exactly?

The most common reply when I share my excitement about this volunteer opportunity is: "so what are you going to do exactly?" Friends and family want to know, and so do I.
E.mails come inviting me to training. Training that takes place four days after I start my first shift. Credentials and uniforms are scheduled for twenty-two days later. How does that work, I wonder.
I called the volunteer info line and had a nice chat with the volunteer manning the phone. She had to call in her supervisor to help figure this out. No, there is not any earlier training. No, apparently, I don't need the uniform to start. and no, there are no specifics on what I will be doing exactly.
Ok, there isn't an answer to this question, yet. I'm flexible though. And with Christmas so close at hand, there are plenty of other things to do.