Reply to Urgent for tomorrow night! setting up S4 in the club

hey guys - quick change of plans and i want to use solely my S4 in the club. How do i go about plugging it in if the have CDJ currently?

at home i have speakers running through an AMP so i only have RCA cables going into very left two (red/white) MAIN OUTs. They wouldn't have different cables for different channels, would they? how would i set it up then?

What are the other (black colored - i believe its 1/4inches?) MAIN OUTs ports for? Monitors?

I need it for tomorrow so any quick help is appreciated! Thanks!