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So you have run the 14/3 in between the 2 switches ?
Here is a picture of a typical 3 way I know it dosen't show power coming into the light but you will get the idea If not i will find you a picture of one with power coming into the light
The existing box only has 1 14/2 wire in it hooked to a single pole switch Black to black pole white to white pole copper to green. I have run a new 14/3 wire to a new second box I have 2 new 3 way switches how do I wire switch #1 existing box 1 14/2 wire, 1 14/3 wire and how do I wire switch #2 1 14/3 wire.
I don't know how the lights are wired they are 8 ceiling lights wired together in an existing ceiling. Since the existing single pole switch had only one wire in it and it turned the 8 lights on and off I figured it had to be a switch leg down to switch are you telling me I have to rewire the existing lights at the power source?