Glad I could help! RP is scarily daunting at first. Or sometimes even when you've been doing it for years like I have!
That does sound like fandom, yes. I know of a few games of varying sizes and styles for fandom games.
And there are definitely games out there for modern original characters! There's probably a game for every scenario imaginable by now. As the poster above mentioned, somewhere like wannarp is a good place to hunt for adverts for various types of games.
As far as Celeb goes, that's the gist of it as far as I know, but I've never played it so I couldn't really comment that much. It does seem to be quite research heavy so it might be quite heavy to get into straight away!
I completely agree with the advice given above too. Most players are nice people at heart, who are welcoming to newbies. So be open to any advice from people who offer (but don't always follow everything!) and be honest with other players. If there's something you're not understanding or not comfortable with, then say so, people will respect you for it.
And a big thing is to remember that we're all people! It can be so so easy to forget that when all you see is typed words (I know I've been guilty of it on occasion!) but we're human, and often from different places with different mannerisms. We might use slang from other countries or areas, so what we mean to say might not be how it comes across. We have crazy lives with work or kids or partners and stresses that as much as we might try to keep out of our game lives, so often creep through anyway. My point is that if you've received an e-mail or message that makes you think 'gah, have I done something wrong?!' or makes you angry, then it might not be what that person intended to put across.
I hope that made some kind of sense (my coffee has worn off so I'm into babbling mode. See, human!!)