How do I get started here?

Hint 1 of 5:

You can do some window shopping.

Hint 2 of 5:

You can talk with the fat man.

Hint 3 of 5:

He will even show a strange interest in your pot.

Hint 4 of 5:

And you should notice his drinking habits.

Hint 5 of 5:

You should have a chat with the gallery owner.