It should start like any other D&D adventure; So a rogue, a barbarian and a cleric walk into a bar......
Yea, you can never go wrong with the basics. Actually, a game where you just idle at the inn at the beginning with no particular objective would be refreshing at this point. All these Chosen One tropes with world saving consequences having me doze off at the desk.
Can't say I disagree. Ambition and curiosity are good enough motivators. We can do better than just the inn, though. Something should tie the party together. Just need to have a good premise for a group that can bring characters of all backgrounds together.