Using a fake letter, if it works, would be the absolute worst way to come to Canada. It might get you into Canada but once you're here you still have to find an actual job in your field and with a Bachelors degree from another country and no experience it's going to be super hard. I would apply for the Visa being as truthful as possible using the job offer from your Uncle, but while you wait for the visa and get everything together you really should find a job in your field where you are currently and get some job experience.
Not to mention, lying in your application is just so sleezy. It's why you are having such a negative reaction to your posts here. We are all honest people trying to bring family members like husbands and wives to Canada. Many of the people on these forums have been separated from their spouses for years, we tell the truth and give tons of evidence and still some people are denied and have to appeal. Then we come on here to talk to our fellow people who are going through the same thing as us and we read your message asking for advice on how to properly go about lying in your application for a workers visa. This is the kind of thing that makes people angry. Honest people who just want to have a normal life in Canada with their family have to go through this application hell and wait forever, why? because people like you have lied on applications and made the process stricter and more difficult for the rest of us.
If you are interested in advice on how to truthfully and legally get a visa to Canada, post something to that effect. If not, then this is not the forum for you and you should not continue to post here.