I fail to see what you are looking for... A switch powers the relay, the relay powers the lights. About as simple as wiring gets. Do you just mean you have never done wiring and need an idea about how to do this? If so:
1. find a circuit to use to feed power to the lights. If you want it switched with the key, make sure the circuit is switched by checking it with the key on and off.
2. draw power from the circuit, put a fuse in it, and run that to the switched terminal on the relay.
3. Run the the other switched terminal to the lights
4. Run the other pole of the light to a ground near the lights (any screw with good contact should work, or drill for a new one)
5. Pick a circuit to use for the switch that drives the relay - it could be the same circuit as above. Run wire from power source to switch, then from switch to relay coil terminal, then run wire from other relay coil terminal to nearby ground, as above.
With pretty much any vehicle wiring, the whole metal frame/chassis is ground, so you don't need to run 2 wires to most things, just run power and then ground nearby.
I'm still not sure if this is what you wanted, but hopefully it helps.