Hi,
My case is a lot simpler, but I hope my answers would still help!
For Q1, I emailed NSERC regarding the same question for my PGS-D since I'm out of the country. The email reply says "Yes you can either send them by Fax or email, however please send it only once. " I would assume that this applies to you as well.
For Q2, I assume that it's the personal contact info. I am not sure why they would need the school's information since the school name should be enough...
For Q3, I'm not sure I had some questions about the forms, and I contacted GSO at my university. They were very responsive. I guess they should be less overloaded compared to NSERC. You can try asking them too.
Congrats