FFX is a great game to start. Tidus is annoying innitially but he grows on you. The story is great and despite what some might tell you, the VA is actually pretty good(awkward moments notwithstanding). The characters are very interesting, especially Auron.
FFXII might not be a good place to start. The game is not bad at all but it is a love it/hate it game. Then again, you might have a better chance of liking it if you play it first and despite the relative complexity of the game's battle system, the game is suprisingly easy to get into. The story and characters is where gamers are usually divided. Some say the story is a nice change of pace and that the characters are well defined and are well-developed while others say the story is boring and the characters are under-developed.
If you are looking for great story, get FFX(not that FFXII's story is bad). If you are looking for great gameplay, try FFXII(not that FFX's gameplay is bad).















