[mitsur]

First look up a the post subgect.That will explain.
Okay:
When you start out, go to the little kids with Blitz Balls(The big blue balls).Talk to them and get your name.Then talk to ladys near the kids.Then after Tidus is done talking to everyone,there will be a short part where you see a Guy(Aroun)relese sprit energy.Then a blob of water(sin covered in water.Note:Sin is the ultimate boss)Will come.There will be a shence with Blitzball.Tidus will see Sin when he does a signiture move.