You may feel that you want to, or, your guests may ask you to.
I dunno, you tell me. I personally don’t write one out, but I’ve also been blessed with the gift of gab. You may find that it’s easier for you to keep things flowing if you have something written out. If that’s the case, write something out. I also do not send my guests a list of questions beforehand. You may feel that you want to, or, your guests may ask you to. Do what works best for you. If you’re not sure what works best for you, just get started and figure it out as you go.