Creating a RAID 1

I had a mirrored RAID where one of the drives failed.  I've backed up the data and broken the RAID.  I'd like to create a new RAID with the good drive from the old RAID and a new drive.  When I create the RAID, will the Disk Utility ask me which drive has the data that I want to keep?  Or will it erase both drives and give me a blank RAID?
I'm hesitant to hit that "Create" button until I know what happens next.  I'm running 10.8.3.
Thanks!

Did you simply remove one drive (and nothing more) ?
If so, your RAID should still exist, but be in a "Degraded" state, and you can proceed to add a drive and rebuild.
or did you actively type Terminal commands to eliminate the RAID?
The bottom line is: What shows in Disk Utility? Is there a RAID?
If not, you will need two (empty) drives to create a new one from your Backups using Disk Utility.
If you are willing to learn about some esoteric Terminal commands, there is a somewhat risky way to create a one-drive Mirrored RAID that can be upgraded by adding an empty drive later.

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