how to make friend via messages ??

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i saw this girl profile a few days ago on facebook, actually i cannot see her face since i cannot view her full profile the photo is very small, and i can hardly see her but whatever, and then i just send her a message, only a 'hi .. ^^' and that's it ! and then i push the send button i actually didn't hope she'll reply me, but she did reply the message.. hahaa she replied it a little longer than my message.. ' hi, how are you doing ?' ... i confused what to write next.. hahahaa LOL what that means ?? what should i write then ?? the girl is korean, and i'm not a korean i got no idea about things to talk with a korean, LOL i seldom practice my english here, so it's kinda hard to continue the conversation since i have no idea with the flow help me ?? hahahaa.. LOL just trying to be an attractive guy here.. hahahaa, silly me to write this down, hahahaa thanks for all of your respond.. ^^