I'm also new here and also am one who experiences voices. I'm intrigued to hear more about the differences between the external and internal voices you experience. Mine are definitely external.
I have a very sheltered life and find that helps, to a point. It is also debilitating at the same time. I have just recently started venturing back into town and getting about again, after much help with a psychologist who worked on Mindfullness techniques with me for a few months.
I take med's for the voices and also for my other experiences. It took years to find the right mix for me, I hope that your journey is quicker in that regard. The med's have reduced, but not eliminated the voices I experience.
Personally, I don't believe that med's alone are the cure, but are part of the journey to wellness and living a full life again.
Regarding my voices, I acknowledge them, but they are not the boss of me and I let them know that! It seems to work for me, they are still there, but it takes the edge off of them for me. I talk to them out loud when I am alone, but not when out in public. Then, I talk to them internally, with my mind, I suppose.
I don't know if any of that has been of assistance to you, I hope so. It seems that I have rambled a bit there... 