What you need is carbon copy cloner Http://www.bombich.com/software/ccc.html
I would suggest:
Add the drive, and format/partition it with disk utility (Don't forget to add the boot in os 9 option)
Make the first partition < 8Meg.
I'd suggest paritions of 7 gig for osx 1-2 gig for os 9 and the rest for "documents" (I also create a 750mb disk for swap, but that is kind of esoteric to get working, search the web for "move osx swap" for more info)
CCClone what you have to the first disk partition and then move the os9 to it's partition.
Remember that the disk must be in the master (0) position of the ATA to boot.
JHV