GO to track of the wolf in the states and order yourself a 54 caliber flintlock in a Great Planes kit. The Great Planes kit has a 1in60 twist which is optimized for round ball. While yur at it also order a 54 caliber bullet mold, furnace, and lead ladle. I would also order some pre cut patches in .018 and .020 thou. You can lube em with lard, either vegetable or animal. You will also need a 54 caliber cleaning jag and a range rod with the proper thread size either 10/22 or 8/22 to fit your jag. Go to their web site and they will list everything U need.
The Lyman kits are basically sand, finish, and assemble, very easy. Dont forget to order the proper sized flints, they have a section on flints with recommended sizes for the various bands of locks. You have much to learn, take it slow and read lots. There are numerous muzzle loading black powder forums with lots of useful posts and friendly members who are only too happy to answer a newbs questions. I recommended the 54 because it is just as good as the 50 only more better, more knock em down if U intend to hunt.
Now as to yur black powder, it is very difficult to get in Canada because of all the regulations. It can be found but you will have to research it. One source could be your muzzle loading clubs and rendezvous, where they dress in mountain man period clothes and reenact the different periods of Canadian and American 18th and 19th Century. Some of the guys there do sell powder, The artificial or synthetic powders such as pyrodex and tripple 7 do not work in rock lock rifles unless you do a binary charge. 5grains of 3f holy black first down the muzzle then 65 grains or so of trip 7 or pyrodex and 3f real black powder in the pan. THat is one way of making your hard one holy black last longer.