FFXII - Walkthrough - Mt. Bur-Omisace
Save your game. To the right of the save point is everyone's favourite map- wielding moogle, sporting maps for Paramina Rift and Mt Bur-Omisace. I'll assume you buy the Paramina Rift one, as my future directions will be based on it.
Larsa will be leaving your party soon, so before you proceed any further: if you want to do any hunts w/ a helpful 4th member, do them now while Larsa's around.
When you're ready to continue the game, go to the Hall of the Light. A few cutscenes, some new faces, a shocking development, and the next stop on our trip: the Stilshrine of Miriam. Look at your map of Paramina Rift to figure out how to get there (it's directly to the south - the exit you see to the southwest is a dungeon where you'll be vastly underlevelled at this point in the game).