Are you an AMA, BCAA, or AAA member? You can head into their office for guidebooks, and maps etc. for free (included in the price of your membership).
You can get a pretty detailed map on Google Earth, or an Atlas.
Also once you arrive in the Yukon, the visitor centers have maps available for free or for purchase.
I would say do some internet research, and then ask locals when you arrive what they think that you absolutely should not miss. Locals are always so helpful. about 3 years ago