To begin / Jack:
In order to begin the CC-Group Quest you need to first find and challenge card players around Balamb Garden.
Once you have completed 15 card games you will be able to find and challenge the CC-Group’s Jack. Jack is located in the front entranceway of Balamb Garden.
This guide has everything you need:https://jegged.com/Games/Final-Fantasy-VIII/Side-Quests/The-...