Plenty of time and a healthy bank account.
You need to decide do you want a rough/walked up shoot or a semi commercial shoot with let days. The later will cost the most as a high volume of birds are required, pens, feeders, clean water supply, feed, a ‘keeper, transport a good beating team.
Assuming you have the land with a mixture of woods and fields you need to look at siting your pen and feeders. The woods would be ideal. They should be light and airy but provide enough cover for your Pheasants to feel safe in.
A water supply is a must, the reason most Pheasants stray is to look for water. Grain with aniseed added helps to retain your birds. Grit is a must as the birds require gizzard grit for digestion. Another reason for straying is birds looking for grit.
Cover crops should be put in (some time ago). Kale, maize or sunflowers are ideal. As they suggest they provide cover but also additional food. Strips should be cut in for the birds to lounge in and be flushed from.
Ex layers maybe a good starter as they are cheap (about £2 each). They are a mature bird and a little more hardy to the newbie 'keeper! Poults will cost more. £3.25 approx each at 7 weeks old. Poults will require a lot of time from you and fellow guns.
Thats a very small insight into owning and running a shoot. Have done it for a few years now. Its one way of getting affordable shooting. I don't always have a £1000 on the hip for a day out.