Reply to Numark Mixtrack

I'm new to the community s and I have a few questions.
My partner and I are what I call laptop DJ's we use a laptop a mixer amp and speakers, we want to add controllers but don't wanna send a ton since we only DJ a couple times a month for fun we only charge for weddings and such everything else we only charge fuel just because we both love music so much and crowd control........anyway I'm looking to buy the numark mixtrack but I don't know what else I need to purchase, I want to scratch a little and listen to my next track for cueing etc etc.
Thanks in advance.