"So since I am now new server owner I can post it, right?"
Correct, you may post it.
"And there will be only one server listing, as I am aware you can post 2 servers on 2 accounts?"
Not sure what you mean by this, you're only allowed one account on PMC, and one server submission at any given time.
I'd recommend waiting for a Moderator to answer as I don't visit this website frequently enough to know the rules well.