It is a little embarrassing how lazy these Chinese electronics companies have become. You are basically getting sold half of the product you would need to power your light accessories. This "dual LED light switch" is really a dual relay activator. If you tried to use this alone to power the 4 Pods at 12V 7A, the switch would burn up.
They know they are preying on unsuspecting customers. Their lack of instructions and putting "You MUST use a relay" is a way of saving face. These switches are used to trigger a backlight on the buttons when the vehicle is on, to trigger a positive current to activate relay 1 (you have to buy separately), and to trigger a positive current to activate relay 2 (also sold separately).
Rant aside, relays such as this is what you will need to buy to run this in your setup.
Amazon.com: 5 Pack 40/30 AMP 12 V DC Waterproof Relay and Harness - Heavy Duty 12 AWG Tinned Copper Wires, 5-PIN SPDT Bosch Style Automotive Relay: Industrial & Scientific
You need 1 if you want to run the entire circuit on 1/2 of the buttons on that switch. You will need 2 if you want to use both buttons.
I don't have my electronics/programming software on this computer, so I will hurry and draw you up a crappy version with good old paint. I'll post it in a second. Turned out like crap haha! I'll pm it to you, just ask me if you have any questions