I wish you luck on your stocking. Over many years (about 35 years) on my farm I have stocked pheasants It is now in CRP and has springs and creek running through it. I have marked all the birds I have released and very seldom kill one that is marked. You need a very intensive predator control and You should have them in pens near the cover. Set them up so that you can open a pen in the evening and let them go on their own volition. Keep feed and water in the pen for a week or so so that they can come back to get a supplement till they find out what they can eat in the wild. The problem with releasing these chicks is they have no mother to show them what to do. You should also spray them with a little water to wet them down for a few days prior to release. This will help them start to preen and waterproof themselves. The reason I recommend 4 weeks for release is that after 4 weeks of age they seem to have been so imprinted on the feed trough that they never do learn to go on their own. I hate to throw cold water on your plans but try it maybe you will have success. Good luck.