There is already a process dedicated to that, it's called fstab, search these forums, the file is /etc/fstab
take a look at it's format, pretty simple to work out, although nfs shares (i presume?) the path is nfs://ip if i remember right
distros differ sometimes in where the boot up scripts. but take a look in /etc/rc.d/rc<your run level>.d (atleast on fedora

) there are scripts there with S# and K# S is start the lower the number the high the priority, K is kill