1. What is NOA? You get it when you do your taxes here. N/A to you at the moment. But you still need to address it. (Please read the guide in its entirety) it will reference it. Google Notice of Assessment or search the forum. If you have Canadian family here ask them as well.
2. My wife does not have her DOB certificate. In India we use the SSC (10th Grade) school certificate as DOB proof. Do you know if that works or should we go an apply for her DOB certificate now? Check online for the specific requirements for India. I'm not sure. Or search the forum I'm sure that has been asked before.