You will not be able to sustainably hunt and fish on land you actually own. You can't buy enough land unless you are wealthy. Hunter gatherer bands typically have hundreds of square miles per band, and often had a seasonal migration route. E.g. Move to a particular prairie region to harvest camas bulbs; to a stream for the salmon catch; to a marsh for the duck and muskrat harvest.
That said, a plot of land and "Reasonable use of surrounding Crown Land" is the way some land leases here in Canada phrase it. In some cases that reasonable use included everything but mining and mass forestry operations for miles in every direction. This, in once case specifically allowed hunting, fishing, wild rice harvesting.
Yet this is in many cases not very sustainable. I knew one guy who owned a fly in fish camp. He had a big truck garden at his base. Grew most of the produce they used. When I met him they had just finished putting up a 120 foot tower for a 3 kW wind turbine to reduce the generator operating time.
The cabins were a mix of logs for the walls and roof beams, and plywood and 2x4's for things that had to be flat. The latter was flown in.
At a time when gas cost $2/gallon at Fort MacMurray, he figured it cost $7/gallon by the time he flew it in. And he owned and flew his own planes.
He lived there only from spring breakup to the end of bear hunting season. The rest the year, they had a house in Ft. Mac.
Sustainable? You tell me.
You need a place that has good enough contact with the world that your sustainability isn't tarnished with outrageous transport costs. This probably means in the neighbourhood of a settlement, on a road, or on one of the major transport rivers that has freight traffic.
You need a place that has reasonable soil, and that isn't on top of permafrost. Check the Yukon River between Dawson and Circle.
There's a guy in Fairbanks who grows apples. You can use apples as a major source of carbohydrates.
Gardening can be very good if you have decent soil. The growing season is short but the days are very long.
Read John McPhee's book, "Coming into the Country"
On reddit there is a good group /r/homestead.
Also see the forums on http://permies.com
Motherearthnews has a CD with all of their back articles on it.
Get good at spreadsheets. You need to think in terms of having everything you need for at least a year at a time. How many jars will it take to do all the canning? How much sugar? How many feet of corn do you need to plant? None of the questions are difficult, but there are MANY of them. You likely won't have a hardware store nearby.