The first thing I teach is how the rotation works, but if you're familiar with how Four Square works, you'll be fine. Here's how I teach it: I'll have a couple students stand with me in a line. I'm first, so I'm holding up the number one with my hand. The other students hold up their hands for 2nd, 3rd, and 4th. Then I tell them to imagine we're at Chipotle, waiting in line (because I love Chipotle and that's the only place I wait in lines anymore). If Player 2 leaves to go wash their hands, who moves up? The obvious answer is the people in 3rd and 4th. Then the player that left just goes to the back. I repeat the question a couple times, then we go over to the court. I don't use the terms KING, QUEEN, etc. Instead, I have dots like you'd see on dice in each corner. Those dots indicate FIRST, SECOND, THIRD, FOURTH. And you want to get to FIRST. That way, you can serve.