It is possible to connect a keyboard to a PS4, right? Doing that should make it easier to talk with others.

You can do all classes and jobs on a single character. You will not lose progress on your existing class by leveling other jobs or classes.

To become a Bard you need to finish the level 30 Archer class quest. Once that is done there will be a quest available near you that will let you pick up the Bard job.