You found yourself exploring a place where the finish precedes the start, where a pride goes after a fall, where creation follows Armageddon, and where dinner arrives not long after dessert.
What letter this sort of a world starts from?
You are in a DICTIONARY.
FINISH comes before START, FALL precedes PRIDE, ARMAGEDDON precedes CREATION, and DESSERT precedes DINNER, though not far away from it.