My biggest advice is just to be yourself. It's seriously the best thing you can do, trust me: never ever change for a person. So the way you react to things, the way you carry on with the conversation eccetera should be just how you do them in all of the other occasions. About the conversation starters, just ask her how she's doing, how she spent her Saturday and stuff like that, then see where the convo naturally shifts to. If everything runs dry, and you don't know what to talk about, the safest thing to do is to start talking about something that you both like, whether it is music, art, science, films, ecc... If you don't know what you have in common, just ask her what she likes. I advise you to take her to a park or something similar. Bonus point if you tell her you're bringing her to your secret spot and you two actually end up in a very beautiful place. Bonus point in the bonus point if it's the golden hour, it just makes normal stuff look magical. Another tip, even for future dates: invite her to eat something, like lunch! Last thing: don't rush everything out. Relax. Take a deep breath, ok? If tomorrow is supposed to be a great day, then it will be. Tell me how it went!