What starts the downswing?

The start of the downswing is identical to that of walking, you simply transfer your weight from one leg to the other

Try this drill for the answer in the golf swing:

Step In Drill:

Setup with a narrow stance and place the ball about an inch outside of your left foot (Righties). Make a smooth backswing and just as you are about to start the downswing allow your left foot to step to the left side of the ball. In reality your left leg should start to move just before you reach the top of your backswing.

As your weight naturally settles on your left side fire your body through the ball to your finish position.

Repeat this drill a number of times and try to pick up the wave like motion that will start to come after a few shots.

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Best Regards
Brian

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Funny o'l game!