I'm no expert, but you definitely don't want to kick out your back foot. As a preface, I ride a fully cambered board, and this what my motion feels like when I'm going from toe to heel- most of my weight is on my front foot (probably a 60/40 split) and applying pressure to my heel edge (picture lifting your toes up on that front foot), knees are bent and hips are moving down toward the snow like I'm going to sit down, and I'm driving my calf of my front leg into my highback. Also, I have my front knee and shoulder opening up toward my direction of travel. I think of it like I'm moving my front knee and shoulder and the pressure of my front heel toward my front heelside contact point on my edge. The turn gets initiated and my back foot just follows as gravity takes the nose of my board in the new direction.
Hope that helps. I'm sure some others can give you some good tips too