Reply to Traktor S4 Audio Setup Noob

HI, I'm new to the community and to the world of djing so I have a silly question, but please bare with me.

I recently purchased the Traktor S4 and I'm not sure how to get the sound working properly eg. deck A playing on my speakers and deck B playing on my headphones. What do I need or need to do specifically. Perhaps my audio setup, output and input routings are not done right?

Help would be greatly appreciated, thanks.