Can someone give me an idiots guide how to wire these up? I dont know electrics the have a positive wire (black&white) and a negative wire (black)

and a few snap connectors (which iv already thrown away lol)

i know i need to lengthen the wires but i wanna run the wires through the roof lining the interior light, its just the which wire do i connect to which? Cheers

these are the leds,