Answers below as per my understanding! Seniors can correct me if i'm wrong.
I believe the intention should be to make sure you don't give any reason for CIC to reject your application
.
1) Yes you can pay for both you and spouse using your credit card - please ensure there is enough time before card expires and that your bank does not put restrictions on CAD$
2) Based on which NOC quota you're applying for - the job description letter should have more or less similar profile as in the NOC description
3) Yes (Otherwise an affidavit with Notory is good enough - ensure the "e-stamp" doesnot have non-english letters, otherwise you might have to submit a translation as well)
4) Yes (Get a bank certificate that you have deposit - the general deposit slip might not be enough)
Hurry up & All the best!