Fatima, you will need to prove that the Job was Paid. You should get a letter from his Employee showing that he was paid so and so for that job. Otherwise there might be problems.
As for the submitting the degree later, well that is fine. But the points are calculated when you will send the application to CIO (Sydney, Canada), will they accept the course complete letter? I am not so sure they will.
Name difference can also be a problem. What difference it is? spelling? then it is fine. But if it is altogether a different name, then I am not sure what the outcome will be. Do include a cover letter explaining why is it so. Try to re-apply for Birth Certificate and include a receipt that you are in the process of getting the correction done. OR include something in the reference regarding name change, later after Birth Certificate was made.
Anyways, we all can give suggestions, the Final decision is with CIO Officer. Calculate your points 4 for the time being. As for your Husband's work exp and paid job proof, do not overlook the importance of it, you might get rejection straight away if you fail to prove that he performed specifically required Job Duties and that His job was Paid.
Hope this helps.
