Hello Svenn.
A few years back, a supply of original Canadian Army Formation water transfer decals surfaced here in Canada (red rectangular background surmounted by the gold maple leaf). The original company information was on the backing paper for them. Somebody in Ontario subsequently had new ones printed up covering all WW2 Cdn Div Formations. Somebody on the forum will likely let you know where they might still be available.
As for the units within each Cdn Army Formation, a number of people over the years have assembled detailed diagrams for them, identifying the appropriate numbering, colours and even down to the regiments involved. There are bound to be sites, or PDF files people will soon refer you to for this information.
Once you have narrowed down what unit/regiment you want to represent, specific detail markings will be a piece of cake.
So, in short, Svenn, dust off your decision making brain cells, you should be getting all sorts of great information. You will be getting loads of stuff to review!
Cheers,
David