1) Hey, the game I'm playing is the first in the series, it is a remake/port of the original PS3 version, with plenty of improvements (apparently) so you're basically going in to the series at the beginning.
2) In terms of gameplay the vast majority of your time will be spent in dungeons fighting or in conversation between characters. There are no towns or world to properly explorem the overworld map allows you to select between dungeons and lands, but towns where the guild (side quests) and shops are, are basically just pretty menus.
The combat system in the game is great, plays out like a cross between an Action RPG and an MMO. You see the enemies in the dungeon, combat starts by touching them, you then get a turn based system where you can move each character about and attack/use items/use special moves. Attacking is done through combos with attacks with the x button damaging the enemies break/shield, O button being your heavy hitting attack and triangle being fast multi hit attacks with lesser power. Once one player has used their combo it's on to the next player/enemy to have their turn.
The general aim is to destroy the enemies break bar as quickly as possible so that your heavy hitting attacks do even more damage.
3) I'm about 8 hours in and just finished chapter 2 of the story, I'm led to believe there are 8 chapters?