Talking with new people

I think that I finally started moving on after breaking up with my boyfriend. I got interested in a guy from my school, I could say that he is kinda my crush but I mostly want to be just friends with him at the moment. The problem is that after I finally texted him I realized that I cant really hold a conversation with him, not because that he isnt interested but because I get stressed dont know what I should say. What can I do to make myself feel more relaxed about this situation? What things should I ask him/tell him to keep the conversation going?

Im also worried that I might make him feel uncomfortable with what I say, or even scare him. I have a dumb sense of humor and I usually joke about weird or disgusting things.

The only things that I know about him for the moment is that he enjoys playing video games and listens to rap