1. Yes, this is aor1 for the sponsor
2. Yes u can link the application now. U can find it here:
http://www.cic.gc.ca/english/e-services/account.asp
3. Yes there will be 2 emails to the principal applicant. 1 is to acknowledge his/her application that has been received and another one giving instructions on how to link the application online
4. Next step is to wait for sponsorship eligibility/approval that usually takes 3-10 working days.
Note: these answers are based from my experience and those who have shared theirs on this forum but this may vary depending on application case.
Good luck!