The init system of FreeBSD is quite different to the Linux. There is no concept of symbolic link of the init script to each run level and no run level. All you have is one big long list of init scripts and very simple way to administer these scripts. If you want some further readings, check out the original paper on rc.d system.

Here is a short tutorial, hopefully someone will find it useful. If you need to know more in depth, check out the FreeBSD document.