If there are only two wires then one is HOT and the other is GROUND. So one goes to the the back of the volume pot and the other to the lug on the volume pot. You only have two choices so one of them must be right, try it.
Same again with the output jack wires, if all your grounds are not connected you will get no sound.
*Check a Strat wiring diagram if your not sure on the basic wiring*