Ways to be more verbal as a sub?

Hey team, my Dom really loves it when I talk to him, I'm generally loud when it comes to moaning or screaming but I never know what to say back to him, like it leaves me in the moment. I'm unsure how to make what I want verbal while still being submissive if that makes sense. Right now I'm studying at a school 6 hours away from "Daddy" and I want to make my visits back home really good for him.