FFXIV used to be free to play, but that was before the start of the year. It is subscription based again because they finally started updating the game it bring it to the proper state.
There was a lot of things to go through in FFXI, but it was pretty straightforward. I never had any problems with it on the PS2 or PC. So I can't really speak about it being confusing.
The official site has information on the game and world. It is not a huge amount of info, but there is still quite a bit in there on the jobs, locations and system.
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