I am not sure what to talk about with someone I like though.

You need not be constantly talking in order to be interesting. In fact, a lot of people like it when the other person at least appears to be listening. So listen! After greeting the other person, ask them what interesting thing happened to them recently. If there's nothing, ask them to tell you a funny story.

I can't tell you what to respond because the circumstances will vary. You will need to listen and formulate your own responses.

you don't need to talk a lot to be interesting. You need to have something interesting in you at first. Methods are numerous and every guy likes something else, so I can't provide consolidated list. Here is what I like about women:

If you were on date with me (what I hope will be very soon) all I am seeking in you is some deeper personality. Maybe you like music? Or art? Or science? Or you have lovely family? Or you traveled a lot? Just something more then "I go to school/work than hang on facebook than I go clubbing than I go sleep".

As you can see, very easy. Just suggest something interesting about you and I, myself, will mine your inner beauty out of you.

Ask them questions about themselves and their interests. Listen and respond.