Conversations

I feel kinda stupid asking this, but here it goes. I gave this guy my number a couple days ago, but I have no idea what to talk to him about. I really don't know him that well yet and I think that's my problem because I usually go out with guys who I've been friends with forever and then I don't have problems with the conversation. I'm a little shy until I get to know someone, so does anyone have any tips on what to talk about?