If Sasuke wants to everything: Like what is a clan? What is a village? what is a shinobi? (See:
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) He needs to go to a impartial observer . . . That shld not include only the Uchiha as they will have biased views and champion the cause of the clan.
Also oro said that 'them' in a way that they already exists and he has already met them; so are not ressurected people + Oro called Sasuke a child in their contex which implies that they are old, wise and may have knowledge about the current situation also. which can not be the Uchiha clan alone. (See:
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)
So basically they are:
1. Old, wise and Philosophical.
2. Know the truths we all want to learn.
3. They are more than one in number.
4. They have present knowledge
5. They are in a place Sasuke knows very well.
My opinion: An council of elders or something similar.