I would direct your questions to the school and that up with the information here:
Immigration and Citizenship. I'd even call IC. A quick read-through of the linked site shows the work permit would be, at most, 2 to 3 years. Given such a short timeline, I'd suggest you make sure you meet the residency requirements before doing anything (available through the Immigration and Citizenship website). If you want to work in Canada, I'd also look at any restrictions that you might have about travelling to the United States for training or work. I've heard of a few cases over the years where a pilot is hired only to find they cannot fly into the US. It's not a major issue during ab initio flight training, but it becomes a much more difficult proposition the further into your career you go. Many companies conduct their flight or simulator training in the United States, and many charter airlines and up to a regional and mainline airline will see at least some flying into the US, so consider it a must to check out that there are no restrictions from Nigeria to the US.
I'll let someone else touch on funding - but ask the school if they have anything set up with a local bank.