If you allready have a samba startup script in your /etc/init.d -directory,
then the symbolic link can be made by 'ln -s target name_of_your_link'. The first
letter in the symbolic link is either S(start) or K(kill), which means that the service in question
is either started or stoped. The numbering is used to determine the start order.
For more information, see for example
boot-scripts project.