I keep repeating this, but it's best to include a short story description along with genre categories when requesting editor help. That way any potential authors can know whether they're interested in it or not. Also, several author occasionally edit an initial chapter or two to get newbie authors on the right track, before turning it over to more dedicated editors. Ernest and Switch did that for me when I first started, and I'm still using the suggestions they supplied me with.
A major issue is how you transfer the files in question: email, cloud storage site, snail mail? Finally, when you find editors, you need to describe what tasks you're looking for: proofreading (searching for typos), content (looking for plot holes for factual errors), beta-readers (determine how readers are likely to respond to a story), etc. You might also specify areas you're weak in (ex. "My grammar is weak", "I'm terrible at showing" or "I have no clue how to write dialogue").