1) Its online play only.
2)Get the ps2 version for sure if your pc is beloew a 2ghz processor with 512mbDDRAM. Because it will not run vey well below that. You can also get the benchmark which will tell you how the game should run...u can get it off the FFXO website. All PS2's run the game the same and is made to run at its best on the system.
3)In battle, u select attack adn it will auto attack...depending on ur weapon adn stats determine lenght between auto attacks, but if u use a weapon skill, magic or anything else, after its used it will go back to normal attacking. You see the enemies and some will be aggressive towards you depending on ur level. You can also move around the enemy at will.
There is a lot of playability, a lot of missions and quests. No FMV's, all in game cut scenes. If you expect it to be like FF7 and 8, you will be disapointed. Expect a lot different style of game and play. There is a story too.

~ KAMAHAME---Oh shit it's happening again.... ~