In case you haven't visited this blog, here is a link. There is lots of info on Copics here.
http://ilikemarkers.blogspot.com/
I live in OKC, too. (Far NW, near 122nd and Council.) Nice to meetcha!
I don't know of any classes in this area for Copics. I use mostly Bic and Sharpie markers, with a few of the pale Copic colors for contrast.
I'm pretty happy with the results I get. Like everything else, it's all in the eye of the beholder, lol. I just keep making cards and assuming I'm getting better with practice.