I just cant make a conversation

ok where i live thres this area where i see hott gils my age all the time so many of them. I do the usual i give them a smile some times they look scared and some times they give me a smirk back lol . But i dont have any clue on how to go up to a random girl im the music store there or any where else and just start a conversation does any one here have any good ways to spark a coneresation out of nuthingness? any help appreciated

its all about chance and good opening, like a friend introducing you to his ex or something. introduce your self and stuff and some pointers i shall offer.
1 first and most important!!!! DONT BE NEROUS have a high self esteem. chicks cant tell this straight away and will be easily uninterested about you
2 chicks love stories, if you have some talk about it. don't brag about it keep it interesting, and not long
3 listen. CHICKS feel appreciated if a guy listens to them and make some comments now and then just to keep them knowing that your listening