Good topics to talk about are usually interests you both have in common. You can also talk about your favorite places to go or favorite movies/ tv shows.
What you plan to do for the weekend. ask him and if he says hes gonna like hang out with friends then make something up and say you are to but if he says hes not doin anything than say yea neither am...
you should be able to talk about anything on your mind . if he doesn't like you expressing yourself tell him about your day or the football game .
whatever floats his boat [ :