All classes can be fast or slow, and it depends on player's playstyle. There is no "tutorial" class or an "easier" class. At best you can ask which class has minimal impact on performance output which requires as few actions from the player as possible.
Personally I would suggest a ranged class so that you have better view of the battlefield, with long animation frames to give you enough time to learn the Perfect Attack system. Ranger, Force, Bow Braver and Summoner fit the description. Give it a "tanky" subclass like Hunter to increase survivability and/or to reduce frequency of having to evade / actively recuperate.
Once you feel you have grasped the Perfect Attack system, then move on to your favourite class/playstyle.
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