Check out the Alaska section in this forum. Tons of info. Get a Milepost, 2014 should be substantially the same as 2015 which will not be published till March or so. Check out the WEB for the various Canadian and Alaskan towns you may want to stop at, most have WEB sites with lots of information. Check out the Canada AND US Customs rules on crossing the Border each way. You will NEED a US passport to back into the US. Canada also prohibits GUNS, beware.
Numerous books available to give more hints, even a coupon book, well worth the cost.
Plan on taking your time, roads are not the same as the lower 48, speed can be dangerous and costly in repairs. IF you drive reasonably you will be OK. ONLY drive on the top half of your fuel tank, fuel deliveries in rural Canada and Alaska is not a daily activity, sometimes only once a week and if you get there with a low tank on day 5 or 6 you may be there till the truck arrives.
We found Canada was about 25 percent above lower 48 and Alaska another 25 percent. Learn how to convert to metric.
Most of all, ENJOY