...and I did the 500m in 1:58. Is that any good for my first time?
EDIT: I should mention it's also my first time rowing, not just on a Concept2.
What kind of damper were you using?
Like what SC said, don't worry about where your PR stands compared to the rest. Get on some rowing sites, watch some videos, refine your technique (because there is a lot of technique to it, even on a C2), and the PRs will start to take care of themselves.