OK -- you can't start from a disk image, only from a real direct-to-the-drive copy, so what you should do is re-do the copy directly to the drive. Once that's done, you can start up from it and do the rest.
Alternatively, you can restore, but there are bugs in the DVD version of Disk Utility on Intel Macs. You probably won't be able to restore unless you use the command-line (see
this blog post for a discussion).
I think it'd be easier to re-do the full copy...