Welcome to the forum!
Lots of good advice on this site, so I'm sure you'll get it going.
To the point of getting your N unstuck, a 50/50 mixture of automatic transmission
fluid and acetone works good. Some folks use Marvel Mystery oil.
I have one soaking in PB Blaster at the moment, not sure how that will turn out yet.
I also used Engine Release once when everything else failed. It's a little pricey, but it worked.Engine Release
Good luck, and let us know how it goes!