Pheasant hunting in SD has become more commercialized over the years. While road hunting is still allowed (driven hunting), it is not very productive. Staying at a hunting lodge, with prime hunting land, and some pen raised birds, is one option. This will get a guided hunt, lots of birds, and for a person not able to walk much, a driver will place you at the end of field, to shoot as others walk, flushing birds toward you. While there is public land, as well as a lot of leased land to hunt on your own, it is a lot of walking, and again, not very productive. A well trained dog would be a big plus. A person willing to walk, can get some good hunting, using 2-4 people, or even by yourself, hunting section lines, with good cover, and fence rows next to corn fields. You can legally drive section dirt roads, and while 1-2 people walk, the other person can drive ahead a half mile, park, get out block the fence row, wait for others to chase birds to you. You just repeat, can switch walker/driver. This can be a great experience, and actually get some birds in your bag. Just about any dog is helpful if it will stay close to you.
Jerry