We keep 7 birds, no idea what type they are, in an area of about 7x7m. If they stay on the same patch as ours do they will strip every bit of vegetation from it. We bought two chicken coups but found that all the birds only use one anyway so with 2-5 birds you should be fine with only one coup. No need for a male unless you want fertilized eggs. We feed them on kitchen scraps, crushed egg shells and comercial feed as a top up. We messed around with different water systems that we bought but ended up using an old 100L plastic box. For the feed we buy in, we do use a feeder we bought which works quite well.
There is not a great deal of science involved in it. Over here chickens are common and coups are made from just about anything.