Hi A Squared,
Welcome to the Great White North, eh! (or as we'd say in Hoskins "Welkam").
First rule re Class G in Canada is that ATC does not provide (is not permitted to provide) control service in Class G, so you will not receive a clearance into, or through, even if you asked. And yes, IFR flight is permitted in Class G.
The best and clearest sources of info (IMO) are the AIM, published by Transport Canada and available as a free pdf download online (
https://www.tc.gc.ca/eng/civilaviati...-menu-3092.htm) and the Canada Air Pilot (CAP) for which Nav Canada charges a fee. Both publications cite the applicable CARs. I'd start with the AIM, but it's HUGE so perhaps download "RAC" section first as it has all the airspace and flight planning rules and info to get you started. After reading that I'd call the toll free number for the nearest Nav Can FIC to where you are thinking of flying (Whitehorse or Edmonton for example) and get specific info re your route and plans.
Enjoy - and stay safe!
grizz