How to create Jail in FreeBSD

Operating system virtualization is the most effective way to utilize your system resources, jails let you setup isolated mini-systems. Jails are explains well in handbook however, from practical standpoint of view, the presented material is incomplete. Here we will setup few scrips that follow handbook's 'Application of Jails' article and enhance with few missing features. Let note preliminary requirements:

1. Name: j0.dev.local
2. Ip Address: 192.168.10.41
3. Network Interface: em0