Here's something along the lines of what I would write, and usually do. It's a mix of what David D. has said and my own thing.
"her : Hey there,
what do you want to know?
I"m new to this website.
What about you? What is your major?"
What's up with the interview? ;p
Anyway, at least I know you're a real person now. Great. It looks like we have a couple of options here. We can meet up, drive to vegas, get married by Sunday, and have our Honeymoon on Monday. We'll even shack up in a seedy hotel with a heart-shaped, vibrating bed. Since I'm a gentleman I'll pay the 50c to make the bed vibrate.
Then again, we could just meet up for coffee and make friends. We'll have a great conversation and a lot of laughs. The bonus to this is that if you turn out to be a big, hairy man, you won't try any funny business around all those people. And no offense, but if you are a man, I'm leaving. ;p
***End it with A or B depending on the rapport level. For THIS particular girl, I'd go with A. But here are both for you to look at:
A) If you're nice I'd like to chat some more. If you're mean like an 87 year old woman with 32 cats, forget it. So if you're the former, send me your screen name and we'll talk. Oh, and if I wanted to see more pics of you, where would I look?
B) Give me a call tonight. My number is xxx-xxx-xxxx. I get pretty busy at times so if I'm not there just leave a message. Oh, where would I reach you if I wanted to call you 12 times a day? I'd call 13 times but that's just a bit much.
I change it up for each person I respond to to make it more personal but this is an overview of how I respond. No need to answer her questions right now. In fact, I recommend you don't unless it happens to just go along with what you're already talking about in your reply. Once you get on AIM or meet her, then you can answer her questions but even then, be indirect. Someone above went into that already, I think.
With option "A" I get a response with their AIM name about 80% of the time.
With option "B" they call me that night about 15% of the time. BUT, 60% of the time they write back and give me their number and ask me to call them instead. So I end up talking to them that night anyway.
-Shadow