Core system support - the journey begins

OK, I've installed 'core system support' software group. Solaris has started.
What now? There's for ex. no ssh service, no bash or zsh shell.
So I've decided to mount dvd image and install additional packages.

But... which dsk device is the right one?
No mounted device, no vfstab entry, no cdrom life marks on planet Solaris.

I've found it finally with:

for d in `ls /dev/dsk/*s2`; do prtvtoc $d; sleep 2; done

The right one is that with only one slice, with sector count of 4509440 (dvd image size):

*                          First     Sector    Last
* Partition  Tag  Flags    Sector     Count    Sector  Mount Directory
       0      5    01          0   4509440   4509439
       2      5    01          0   4509440   4509439

Mount:

mount -F hsfs -o ro /dev/dsk/c1t0d0s2 /cdrom

and install desired software:

pkgadd -R /a -d /cdrom/Solaris_10/Product
[...]

Select package(s) you wish to process (or 'all' to process all packages).
(default: all) [?,??,q]: SUNWsshcu,SUNWsshr,SUNWsshu,SUNWsshdr,SUNWsshdu,SUNWbash,SUNWzsh

I've used the -R switch because I've done the work inside the shell session invoked from the Installation menu.
The root system has been mounted at /a directory.