I tried to add two recessed lights to our home's master bedroom, and they are not working. I hope you can help me understand what went wrong, and how to make them work. First I installed the lights in the ceiling and wired them together by splicing black to black, white-white, ground-ground. I turned the power off, and cut the power cable to a circuit that powers two lights and the garage door. I put the ends into a junction box, and spliced them with a third wire to use as a power supply for the recessed lights. All of these cables are 14-2. I ran the power supply wire down the wall to a single-pole switch. I attached the black power supply to the lower pole of the switch, and attached the black that goes to the first light to the top pole. I spliced the white to the white that goes on to the first light, and ground to ground. When I turn the power on, the garage door and existing lights work, but the new recessed lights do nothing. I thought I might have the black wires reversed on the switch, so I reversed them and also got no results. Is it not possible to splice into a circuit by using a junction box? Do I need to bring my power supply from an outlet? Do I need to take the power to the lights first and the switch second, and if so how do I wire that? Thanks for any help you can give me

I need a little help installing a double switch. Double switch one going to light fixure and one going to bathroom exhaust fan.