Rob Lagesse has created two easy FreeNAS tutorials. These howto’s are aimed at Windows users wanting to set up a NAS server but having no or little experience with alternative operating systems. All step-by-step with many screenshots.
If you’re an advanced FreeNAS/FreeBSD user you may find these two post interesting: FreeNAS & online snapshot backups, with a script how to backup your data to an online hoster, e.g. Bluehost, or this post: Diy NAS + Xbox 360 = R0X.