One thing that I think helps with clear communication is to be conscious of the on the fact that boundaries are not always bilateral or reciprocal. That is to say, I think that “Heyyyy! You just asked me to not do x, and now you’re doing that exact same thing!” is usually an unproductive thing to say.
I believe that breath meditation is the best place for people to start a regular meditation practice; it is the most basic, foundational, beginner meditation practice. This post contains some breath meditation instructions for beginners.