I think GX can shed some limelight here
And few friends of iMav excel at one liners to get started on subject.
But there is nothing as better than having an advice from a known friend (girl). She might help you but woman tend to be jealous of making others kite fly than their own, but there are some who are NOT.
it's not hard to start conversation. Could be of anything, just don't be shy, be confident & be frank....I will give you one example today.
I had to go to Kanpur for one of my childhood friend's marriage, we were in school from class 2. On the way, I took an A.C bus to kanpur. There was a girl sitting next to the window & I sat next to her. Due to cold whether here, she was coughing a lot...& I mean a lot so I told her "madam, it's better if u come to non-window side....U won't feel cold." She politely refused & sat there only, think I m just flirting & trying to start a conversation. Well, she kept of caughing for 15 mins like that & well...I didn't care much & went to take a small nap (it was a 1.5 hrs journey). She woke me up herself in 10 mins & said she wants to come to my side, away from Window & Cold wind.
Now, I started a conversation, I started by asking what she does etc etc, & finally...at the end of the journey, I got her number. She is college student in Kanpur.
Just keep your eyes open, listen to what they r saying.....analyse & then act.