If you look at videos at Gamespot or Ign, The system is kinda the same. The screen will freeze and let you pick a commad to execute, then for it to keep playing without the screen freezing.
EDIt
The first thing that will affect the battle itself, will be what mode you have selected. There are two options, Active and Wait. You can switch between the two at any point, and it is best to start of with Wait until you get a hang for the system. The two modes do the following:
Active Mode: Fast paced action, this is for the experts, or those gamers that can think on their feet. Whilst in Active mode, when choosing commands the game will not pause, this will give the enemy time to plan its next attack and may very well attack you.
Wait Mode: This is the more relaxed and laid back option of the two, this mode will pause the game whilst you are given time (unlimited ofcourse) to choose your next move. It's a good idea to start on this mode, and then move onto Active once you are more confident about battling, and this is probably the better option for Boss fights, where they can do absurd amount of damage in a short amount of time.
Courtesy of
http://finalfantasy.neoseeker.com/fi...es/adb_system/