Custer , is a good place to start and better in the early season. The hills is one of the only hunting locations that weather can play a factor with your hunt. Early season can turn very fast and a snow fall can shut you down in no time or at the leased limmited your travel. Hunting the hills is a great experence for any turkey hunter and you I'm sure will love it there. Calls for the hills is more of the same type of calls that you would normally use where you hunt now, the only difference is that it is a good Idea to have a couple of calls with Volume. Boat Paddle Box calls or tube calls are great for getting your sound out across some distance of land to strike a bird and work him into a normal calling location that your regular calls will work better.

Not sure on the ATV question , I found there is lots of roads that one can travel on with a truck and it would be far superier then a ATV.

Merriams , tend to travel and fast , so being in shape is a good idea as the air volume is low and can play with you on the first few days of the hunt. There is lots of area to cover in that location , so you won't be short land to hunt...BT