How to talk to this girl.?

Hi, i have deep feelings for this girl named mellisia, and i need help talking to her. The convorsation usually goes like this ---> Me: hola :P, Mellisia: Heyy!, Me: whatchya doin'?, Mellisia: Nothing Much, What about You?, Me: meh, me either :P....... after all that, theres nothing to say....i usually say "gotta go xD, cya later". what can i say after that and how can i say it? what i mean by this is that iv read some more threads about this and they say tell something that happened during your day or tell a story, well telling a story in that posistion is just plain random, its like saying this = Me: whatchya doin'?, Mellisia: Nothing Much, What about you?, Me: meh, me either :P, Me: Hey, this one time my friend Dane got bit by his dog xD. Now, i havent said that yet, but just hearing it seems random, and she might respond like, "okay...." because i know she wouldn't care. so how do i introduce something like that? i am a VERY shy person...