Not sure how it works in Canada but in some (all?) states in the US of A, you're limited to flipping X amount of cars annually before it is considered a "business." That requires the flipper to do things a little differently, meaning they may have to get commercial insurance, business licenses, or jump through some additional red tape to continue the business of flipping cars. Just keep that in mind as you evaluate your options.
For what it's worth, I know a few people who do this, and they're pretty successful. The best ones get a wholesaler's license in order to get a seat at auto auctions. You can find the best deals at auto auctions.
As far as learning how to fix cars, your local community college may have classes you can take, which can be supplemented with Google and Youtube.