I am a former wildlife manager who worked on a pheasant propogation program. Just a couple of things; it is important to remember that the reason there are no pheasants where you are is because there is no pheasant habitat where you are. I don't know where you live, but many have the mistaken impression that cornfields are good pheasant habitat. Cornfields only seasonally provide one of the components of pheasant habitat...food. Research has shown that pheasants almost never starve to death, therefor, food is rarely a "limiting factor" in pheasant numbers. Unless you live in the arid west, water is not really a limiting factor, either. That brings us to cover.
Cover is extremely important to pheasants (and we live in houses for cover!). They require different types of cover for different things, e.g. "nesting cover" is thick grass stands that they feel secure in for sitting on a nest until the eggs hatch while avoiding owls, foxes, skunks, raccoons, opossums, etc. Many hens nest in alfalfa fields because it's the only thing around...then get mowed up by the first hay mowing. I once read that dead hens seldom re-nest...
Winter cover is a limiting factor, also. If there is not enough permanent winter cover around pheasant numbers will suffer. Cattail marshes, thick stands of native warm-season grasses like switchgrass, Indiangrass and bluestem make good winter cover; brome does not. Winter cover must be within about 1/2 to 1 mile at the most, or there won't be many pheasants around. You can get on the pheasants forever website and learn more about cover and food.
If you are going to raise a few birds to release, keep your expectations reasonable. The average life span for a ring-necked pheasant in the wild is 9 - 11 months, in hunted or un-hunted populations. That means most don't make it to their first birthday, but they do get one breeding season (assuming they survive to breeding age, which is about 20 - 30%). Most pheasant restocking programs are put-take operations...birds are raised to adulthood and released for hunting purposes. Restocking efforts to establish new populations or enhance existing numbers usually do the same thing. So, in effect, what we do is keep a bird in captivity from hatch to early fall (1/2 of it's life expectancy), feed it, shelter it, etc., then throw it out to find it's own food, water, cover, and oh-by-the-way bring off a good bunch of chicks next spring, would ya? I always thought it might be better to raise them to 6 - 8 weeks and release the chicks with a hen. Sure, you'll lose some chicks like normal but the survivors might develop more 'wild' behavior. Food for thought....Also, if you're going to release them, make sure you have overhead shelters for them to get out of storms, etc. Good luck! It's not easy...