Originally Posted by notatall
My question is what the kick should be timed with and when should I start kicking and which leg I should kick on.
The two-beat kick advocated by TI is more for balance than propulsion. It's favored for distance events, as it minimizes leg muscle effort.
Kick down with the opposing
leg at about the time the hand enters the water, as demonstrated in this classic clip. https://www.youtube.com/watch?v=hC8ZZZhabp4
The kick helps to propel the body into a streamlined position.