how to put up lights in backyard ?

firstly, need to check about the input voltage for the up lights.

If it is 12 volt or 24 volt, need to match with the power supply. The power for power supply need to be power of all lights, then divide by 0.8.

If the voltage is 220 volt, 240 volt, then no need power supply (transformer)

then you need to dig a hole according to the diameter of the uplight.

Connect the wire and put the uplight inside.

Then test if the lights workable or not.