Jail.io is an open-source project aiming to faciliate the use of FreeBSD Jails and provide you with viable tools, solutions, services and documents in using and managing jails.
We just began, so why not reading more about jails until we launch?
Reading this brief history and also this Jails paper from the original author, Poul-Henning Kamp, is a must, and so is the great book of FreeBSD Mastery: Jails by Michael W. Lucas.
The official handbook is also a great starting point if you're looking for a quick-start to hack and learn.
Stay tuned, there are good news coming.