I am re-wiring a switch in my home to provide a 3 way switch in my garage. This is what I have got: the power is coming into and going out of the junction box(two 12/2 wires) and two switch legs(one for the garage, one for the kitchen). I know I have to run a 12/3 wire between this box and the one I am installing, but I need to know how to tie all those wires in the existing box together. Please email me a diagram asap. Thank you.