I do freelance editing, and I would suggest that you find a company that hires freelancers like Cactus Communications or one of the other editing firms. The pay is sometimes not that great, but it would help you hone your skills. You could also bid on projects at Elance or elsewhere.
The only way to make good money in copyediting is to find your own repeat clients. Businesses are better than individuals, since they tend to pay better and have more consistent projects.
Could you possibly harness local contacts? Ask around and see if certain businesses are in need of your services. For instance, if you notice that a local newsletter was poorly edited or in general subpar, you could call them and explain how you could improve their copy.
You could also post an ad on your local Craigslist and see if you get any bites, although working through that medium is not for the faint of heart.
