2x4 Set up for beginners

2x4 Set up for beginners

Hi,
Not sure if this is the correct thread please feel free to move this or advise me of any issues in my posting,
I am fairly new to djing, and currently own a numark idj pro using an ipad as a mixer (the app i currently use is DJ Player). I am looking to create a set up for a duo, with myself taking the lead, (spinning electro and trap type instrumentals) and my partner spinning transition tracks and hip hop accapellas. I was looking to do a 2x4 type set up with him using his mixtrack pro and myself using the idj pro with a homebrew ipad to usb Mac adapter and the ipad itself running touchOSC as an alternate midi controller. I know this might sound goofy for a beginner but I was wondering what software would be best for a 4 deck set up for a set of newbies? From what I understand Serato doesnt support custom midi mappings so would Traktor be our best bet? Or what advice might you guys have for learning to dj as a duo?

Thanks so much,
Matt.