Short answers, pulled from the story.
Final Fantasy Tactics Advance launched on the 14th of February 2003 alongside a white Game Boy Advance console. The game was developed over nine months starting in early 2002 at Square's Product Development Division 4.
The story was primarily written by Kyoko Kitahara with Shutaro Yokoyama serving as supporting writer. Character designs were created by Ryoma Itō to give the game a Shōnen manga feel for a younger demographic.
The Law system is a mechanic where a neutral entity known as the Judge imposes random restrictions on battles using yellow and red cards. A yellow card lowers a unit's hit chance while a red card removes the unit from the battlefield entirely.
Hitoshi Sakimoto served as the sound producer and lead composer while Nobuo Uematsu composed the main theme. Additional music was composed by Kaori Ohkoshi and Ayako Saso of SuperSweep.
Final Fantasy Tactics Advance sold over 1.5 million copies worldwide by November 2003. Sales figures included 460,000 units in Japan, 760,000 in North America, and 330,000 in Europe.