I have a couple of (somewhat dated) pages on jails and ezjail
(The pages aren't always up, as I tend to play with the computer running it but)
http://www.scottro.net/qnd/qnd-jail.html
Is the one for jails in general, and in the first paragraph there's a link to the ezjail one. I do recommend ezjail, it does what its name implies and makes it easier, though I think it's still quite necessary to have a reasonable understanding of jails first.