Oooooh... um, I don't know about the actual process of duplicating the roms but I do know that it's illegal.
If your machine came without roms, the best thing is to try amibench.org or eBay to look for the roms you need.
If it already has v3.0 roms, I wouldn't be all that worried about upgrading unless you want OS3.5 on there, in which case I think some vendors do bundle the OS with v3.1 roms.
You could soft-kick 3.1. But that's also of dubious legality.
