How do I migrate data from my old HDD to the new one I replaced it with?

I recently upgraded my HDD to a bigger one (160G to 500G). The old HDD still has all of my data which I would like to migrate to the new drive. I purchased a device that a tech at a computer store recommended but when I plug in the old HDD (using this device) to my Macbook pro the HDD doesn't show up in Finder! Can someone explain what's going on and what I need to do to get my data back? Thanks for all your help.

In the Utilities folder, run Disk Utility with the external disk drive connected and powered up. On the left column of DU's window there should be three devices: the first one would be the name of the new drive you installed and its size, with the volume it has (probably Macintosh HD unless you renamed it) indented below it. Next you should see the device that corresponds to your old drive, now connected via the enclosure the tech sold you; the clue to identifying it is that the name should contain "160 GB" (the size) in it. Below and indented you should see the name your old startup volume had; probably Macintosh HD unless you changed it. And below that you should see SuperDrive, which you can ignore.
If there is no external device in the list (just your new drive and SuperDrive), that means the Mac can't communicate with the external enclosure; should take it back and have the tech set it up right.
If there is a second device in the list, corresponding to your old drive, but the indented volum name under it appears grayed out, select it by clicking on the name to highlight it, click on Repair Disk, let the repairs finish and if no errors are found, click on the Mount icon on the upper bar of the window. Your old disk with all your stuff should now be accessible. If it cannot be repaired or it refuses to mount, report back with any and all messages it may show.
As for moving things over, consider using the Migration Assistant to migrate, as explained here (yours is the third case, Time Machine or other disk migration): http://support.apple.com/kb/HT4889

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