RobB;
For myself; I figure out how I want to feel and ask the Master's and the Universe to send energy to help me feel that way.
If you have never known otherwise than to have an internal dialogue going on it is very difficult to just turn it off, it is easier to ask the energy to convert or change into the "emptiness" state.
For myself, I was taught to work on being calm, to relax, to relax more and finally this dropped into the "emptiness" and a complete feeling of peace. It wasn't overnight.
If you fight this internal dialogue it will only make it defensive. If you just work on feeling relaxed and peaceful then it will come to be.
Focus on what you want in your meditation, don't get distracted by internal dialogue, just let them go.