[日本語がまだありません。書く暇が出来たら書きます。^^;] What you do next is to sit at the command machine which looks like a cockpit. A detailed diagram at the official site shows you what each part of the machine does.
There is a flat area in the middle of the machine and thats where you decide where you want your units on the battle field to be. For example, if you place five cards representing different mobile suits, the mobile suits will appear positioned in that order in the game.
What I found interesting was that depending on where you slide the card and how you do it, the characters/mobile suits will perform different actions. You can see some of the moves available here. The panel also detects if you tilt the cards so that you can attack enemies diagonally. The cards must have some sort of magnetic information embedded or something.
It was intriguing watching all the people shift these cards all over the place and pressing other buttons at the same time. Some of these folks had huge packs of cards on the side - presumably representing other mobile suits and weapons.
Looked like a ton of fun but also looked expensive to collect cards - and also looked very difficult too!