NEED ADVICE about making my first time as easy as i can

hey ladies.

my name's Liz and I'm 25. I've been talking to this guy online who lives in the same city for three months. We plan on meeting soon and I think I want to have sex for the first time EVER with this guy. I've never physically met anyone that I've talked to online and I'm nervous. I'm a virgin. I have not had my first kiss yet either. (yeah. lame I know.) I have a history of being sexually abused and sexually assaulted and am worried that when we get into it, I'll end up having a flashback. I also have Asperger's Syndrome, which is a high functioning autism spectrum disorder, which makes me really awkward and shy. I also want to suck his dick. I know that's weird.

Anyway, do you ladies have any tips, encouragement, hints, etc. for me?

Sorry about the long post.

TIA