X1, Windows Laptop, Mixer DJM900

Hello guys, I have a big doubt.

I want to get the X1 and I just wanna use it with my laptop but I do not know what's the exact setup that I need for this.

For example: if I wanna use my laptop alongside with a X1, do I need a NI soundcard because I have to or what and why? If so, how can I set it up, what software/updates (what to update) do I need, what type of cables I need to connect the soundcard and where in the mixer?

I've got Traktor Pro, just wanna make it very simple with this setup.

Thank you.