Reply to A Little help with my First Club Gig

Hey guys ,
Brand new to the community and I'm looking for your guys expertise. I have my first club gig tommorrow evening . I've been spinning for about a year and finally ready to jump into the club scene.

So at my gig tmrw, I need to bring my own setup. The currently have a pioneer djm 800 mixer. What I'll be bringing;

MacBook Pro running Traktor 2.03
Traktor Kontrol X1
Numark Mixdeck

Now, before it's said, I know the mixdeck isn't a great setup. But it's an ok midi controller and serves its purpose. The only thing I am concerned about is how is it going to sound on a club system?

Second, Ive been reading a little online and stumbled across a post that said I would need a soundcard (audio 2 at least) to run the X1. Is this correct? Wouldnt the mix decks soundcard do the exact same thing at home for me?

Lastly, so I don't look like an idiot when I'm doing soundcheck tommorrow , how to I plug my mixdeck into the djm 800. And when it's plug in(say to channel 1), I would still just use the mixer on the mixdeck , not the djm 800. The dim will basically take the sound from the mixdeck(deck a & b) and distribute through their system...

Thanks for helping me out guys....