Supervisors or veteran copy editors will have a couple of training sessions with new copy editors. And then someone may walk a new person through new duties. Occasionally we send copy editors to conferences or classes. We set up our own training at staff development meetings with speakers, critiques, etc. There isn't any training offered to the news desk that's not available to us.
Extra pages are okay.
Given our turnover, we are always short on copy-editing candidates when the time comes. If we don't have openings at the time you submit it, certainly we will soon. It's tough to find quality copy editors. I'd be interested in knowing where they're hiding, if anyone knows.