Daddyjp,
That is a whole lot. Please see the message I responded to someone else in a similar situation on another thread.
Your academic profile is impressive, well done. Age and Travel history are points of concern. I will try to suggest what you can do to navigate your situation.
1. Sponsorship Letter- I will send a simple format to you through personal messaging.
2. It is very excellent that you have a job that pays you. At least you will be demonstrating to the VO that you are valued in Nigeria and have strong potential to grow, hence an indication to show that you may intend to return, but I will get back to that!
3. Here is the complex part, please try to follow, so you don't make mistakes.
a) You need to convince the VO of 3 basic things to get your study permit approved. I will take them one after the other.
i) Clear purpose of visit- In your case its your intention to study as evidenced by your excellent academic achievements, and letter of admission into a Canadian DLI. So for this I score you and A-minus.
ii) Ability to Fund item (i)- You must be able to demonstrate beyond reasonable doubt that you can afford to pay for your tuition fees and every other associated fees during your stay in Canada. Here I have a few problems. It appears your sponsor is a third party. With the current economic situation in Nigeria, the VO will wonder why a third party would be willing to spend so much on your studies. This could raise a red flag. You have to be able to demonstrate to the VO that you have has a 'long' term relationship with this person, and that is why he/she has vested interested in helping you reach your maximum potential in life. Also what is the source of income of the sponsor, working class, or self employed. The person must be able to show a viable and verifiable source of income.Finally, I would suggest you pay at least your tuition fees for 1st semester if possible, you pay for the whole session. This will show/demonstrate to the VO that your sponsor is indeed willing to invest in your education. In this area I score you a C+ (if you can get the sponsor to pay for tuition fee upfront, having the money in the bank account is no longer sufficient these days).
iii) Intention to return to home country on completion of item (i)- Bros, this is the hardest part to consider. Lets say you scale through items i and ii, you must scale this as well. With respect to your work experience- you don't have a lot, its not really a bad thing, but is your work experience related to your future studies, or just a stop gap job, you did not specify that here? Age- You are at an age or demographic is considered a high risk. These are highly young, mobile, Nigerians, who do not have a lot of prospects back in their country, hence wanting to use the study permit as a route to permanently settle into Canada. The Study permit is a permit that has what is called Dual Intent (both intention to study and and intention to settle). Even though you are emphasizing the fact that you want to study, the VO will look at your profile and could make a decision whether you will come back or not. Travel History- Bros, at 27 and no travel history to any developed country is a very high risk factor. If you had travel you can 'shakara' the VO that I have been to US, UK, Dubai, I did not over stay my visa, I came back home. This gives you credibility. But in your case, there is no precedence to measure what you would do. Here you wil lneed to write a solid SOP that will show that you have some novel invetion you will like to come back to Nigeria to implement. e.g you can focus on how you have interest in renewable energy technologies that will help resolve the power problems in Nigeria. how you hope to start-up a small business that would be involved in such practices. So with respect to Item iii, I would score you a D.
Now this is just my honest assessment based on personal experience. There is a factor you I have not put in here. It is called Divine Favor factor.
Please try to put all the aforementioned in place, then pray well, and God will see you through.
All the best.
Cheers
Omofar.