rear lights help and hazards

hi ppl i need help sorting the rear light out on my clipper. my side light have stopped working bt was fine a couple of days ago and one of my reverse lights dnt work ( passenger side ) but the blub if fine. when i put on the harzards are on the O/S lights work but the N/S dnt work but the N/S work when using the indicators any ideas ppl    

I'd take a good look at the fuses firstly. and then check the earths at the back. take them off, clean them, put them back again. and check them for broken wires