what social amenities does he observe in the beginning his tale? what three brief experiences does he begin with?

The singer begins this epic song with an invocation to the muses referring to Odysseus' long journey home and introducing the main themes of the text: Odysseus' wandering; the entrance of Telemachus into manhood; and their vengeance on the suitors. All the gods but Poseidon pity Odysseus. The singer's narrative begins on Mt. Olympos where the gods are gathered for a feast. They are discussing Aegisthus who has just been killed by Orestes the son of Agamemnon. Zeus speaks first:

"My word, how mortals take the gods to task!
All their afflictions come from us, we hear.
And what of their own failings? Greed and folly
double the suffering in the lot of man.
See how Aigisthos, for his double portion,
stole Agamemnon's wife and killed the soldier on his homecoming day.
And yet Aigisthos knew what doom lay in this." Book 1, lines 48 - 55