Take your time. However, once you get going and all is reasonably relaxed, you can screw as vigorously as you like with little chance of hurting your partner. Sex is most fun when your body takes over and starts moving all by itself with its own rhythm. Don't be afraid when this happens. Just enjoy the wild ride.
Nothing turns off sexual pleasure faster than nervous chatter.
Go ahead and make noise, but don't use coherent sentences. You want to shut down the rational brain and let the body take over. Personally, I like having sex with guys who speak other languages. No matter how much they talk, all I hear is the emotional content, and don't get distracted by the literal meaning. Dirty talk can turn some people on, but turn others totally off.