Surprisingly, the answer is "practically nothing". If you ask Hercules to help you, he ignores you. Only after Zeus obtains the Five Sacred Items does Hercules decide to lend a hand. He will move the rocks that block the throne rooms for Hades and Poseidon, and can smash open the lock on the gate to Mount Olympus. Otherwise, he is a disappointment.
he is in Hercs Hero Hut
in the hero's hut
You can't. They are only decoration, and in fact there is nothing functional in the entire building except Hercules.
Hercules is in the right corner of Hero's Hut on the Main Street of Mythology Island but he will not help you until you have collected all 5 sacred items and Zeus has stolen them.
He is in his snack bar, Herc's Hero Hut, on Main Street. But he is not interested in helping you until after Zeus gets the five sacred items.
In order to move the rock on Mythology Island in Poptropica, you need to find Hercules, who is located in the Hercules' Hero Hut area. Hercules will lend you his strength and help you move the rock.
You don't. There is nothing to buy in Herc's Hero Hut. You will spend it much later, to buy a bag of wind from Aeolus on Mount Olympus.
Until he decides to help you, Hercules is in the same location for the entire game : selling autographs in Herc's Hero Hut (which has no function in the game whatsoever).
There is only one drachma. Get it from the guy in the underworld (Hades temple) for cleaning the graffiti. You will need it near the end of the game on the way to Mount Olympus. There is nothing to buy anywhere in the Hero Hut.
You don't. The only drachma on the island is the one earned for cleaning graffiti at the temple of Hades. It is used much later on the climb to Mount Olympus.*Except for talking to Hercules, nothing in Herc's Hero Hut has any function at all.
On Mythology Island in Poptropica, you spend the drachma coins to purchase various items that help you progress through the island's quests and challenges. These include items such as armor, weapons, and tools that are essential for completing tasks and overcoming obstacles in the game.
You don't. You can only earn one drachma, by cleaning graffiti at the Temple of Hades. You do not buy anything with it until you reach Mount Olympus. Nothing at Herc's Hero Hut is at all functional, and you don't buy his autographed likeness.