don't over think it. when you're together, conversation just happens. the convo will change constantly, stories will be told, etc. if you have a funny story, even if it isn't relevant (aka not a lot of talking is happening) tell it. tell her what you like, ask her what she likes. you'll see things that remind you of something that happened that you can tell her, etc. it's hard when you're nervous and shy but don't over think it and it will generally just "flow" if you two have a connection.