Frankly, I would avoid using DVDs for such a large image, as you are going to need 5 or 6 DVDs to store the image and it only takes one DVD to develop a defect for the entire image to be unrecoverable.
I would recommend using a good quality USB drive with WinPE installed as the boot system. Alternatively if you need to ship the image, then a 32 Gb USB stick is much more resistant to knocks.
Ultimately. to restore an image, you need a bootable DVD with WinPE on it (DOS can be used but does not work with SATA optical drives), and also the Ghost executables. Thereafter, you could just copy your GHO and GHS images to other DVD disks - you should be able to store two per disk. Once you have ghost running, you just put in the first DVD, point Ghost at the GHO file and let it recover the image disk by disk - it will ask for new media whenever it cannot find the next GHS file.