I have my father's Retina IIIc. He gave it (back) to me.
When I was young, and my father was a young father with a family to support and bills to pay, he wanted a IIIc very much. But he was never able to swing the purchase.
A few years ago, after eBay became prevalent, I found a IIIc on eBay and bought it for him as a gift. He used it for a while during his 80s.
He is now 91, and after 60+ years of photography his eyesight isn't really up to using a rangefinder, so he gifted the camera back to me.
They are beautiful cameras that take beautiful photographs. The 50mm f/2.0 lenses are very high quality, and the accessory lenses are functional.
They are complex though, and very few repair people are able to work on them.
You have received a fantastic and valuable (in multiple ways) gift.
I'll see if I have anything shot with mine that is both interesting and scanned and if I do, I'll post it.
And if you are familiar with flickr, this link will give you a few more examples: http://www.flickr.com/groups/359512@N21/
Good luck with everything. It is indeed exciting. In addition to APUG, which has been invaluable, check out YouTube ... There's lots of great info there.