@Hoomzy > Welcome!
In order to get everything setup properly, you would assign all 4 (8) outputs for the mixer within Traktor, one channel (pair) for each deck. You would add control for decks A and B to the CDJs, then manually add mapping for the DJM's MIDI to the samplers. It sounds complex, but really, there's not a lot to it. If you need further help with any particular step, just let us know where you're having trouble.