Hi Everyone!

I am completely new here and also to Canadian Immigration procedures but will try to make things simple.

I applied and got an offer to study Project Management in Post Graduate Certificate Program. The offer letter came in 4th of April, 2016 during which i was still serving the country (NYSC). i passed out on the 14th of the same month and started gathering documents required for visa application. After passing out, I notified a friend whom I've known for over 6 years and he gave me a job in his company as the Senior IT Admin (this is because he knows my capabilities as i have been providing IT solutions for him over the years). He is not a Nigerian but he has been in Nigeria for over 30 years running his late father's construction company.

Now these are some facts in no particular order -
1. I did a diploma program (Diploma in Java) at NIIT in 2011
2. I graduated from Middlesex University UK in 2014 and majored Information Technology and Business Information System (ITBIS) but I failed to collect police character report before I left (wasn't really necessary at the time).
3. I rounded up my NYSC this year
4. My employer has agreed to give me 10 months to study (without pay of course) and also, provide me with all supporting documents that will ease the visa application process (Letter of Recommendation, Sponsorship, Employment Verification, SOA)
5. My employer is currently not in the country as he left for the burial rights of his mum but assured me he'll return by June 13th.
6. I have paid my complete school fees and have at most 6,000CAD in my personal account ( this will certainly mature before resumption which is 6th of September 2016)
7. Before I left for UK in 2013, I registered a Limited liability company in my name but I haven't used the company for business of any sort yet. Only have a bank account in the company name with less than 100,000NGN.
8. I don't have any landed property neither do my parents.
9. I did Computer Project Management as a course in my first Degree so to an extent, I can relate to Project Management in general.

Questions:
1. What are the some disadvantages of using either the paper or online route?
2. Since my sponsor is same as my employer, does he swear an affidavit?
3. My employer returns 13th June, do I have enough time to process my visa or I should defer to January but start the processing as soon as he signs the documents?
4. The fact that my employer has agreed to give me study leave, is it enough alone to convince the VO that I would return OR couple the earlier with my existing non-functional company?
5. I don't have a police certificate from the UK and I left 3 months before the expiration of my study visa (immediately after graduation) is there any reason to worry?


Any answer will be invaluable.
Thanks so much.