I know this might be a foreign concept to a lot of you, but conversations are based around an interchange of thoughts and other inanities. Here's a rule of thumb. If you hear yourself starting your third sentence in a row, stop talking. Stop in midsentence. Think about that for a minute.
People like to talk about themselves.
That's why you have to stop talking about yourself so much, or you'll bore the object of your newfound affection. If you let your new friend talk as much as she wants, chances are good that she'll think you're a great conversationalist. I always try to see some of the more obscure monuments to Napoleon II - most people just don't appreciate his military genius. He nearly managed to unite Europe under one flag, and that was with an understaffed and underequipped force that was facing some of the more powerful armed opponents of the day. I think you get the general idea.