I have several completed short stories, and I'm considering having them line-edited before I submit them.
But I have no idea where to look for editors. How do I know who's any good? Where do I look, and what do I look for?
I think the best way to find an editor is through word of mouth. This is why it's valuable to become part of your local writing community. Writing itself is a solitary endeavor but being a writer benefits from being in the society of writers.
Are there writing centers near you where you could attend events with other writers? Is there an opportunity to join a writing group?
Once one starts meeting other writers, things such as editor recommendations come easily.
There are a number of editors and beta-readers available on fiverr.com for reasonable rates.