I thought it'd be good before getting into the story to explain the main houses and factions so that's what I'll be doing today in a pretty simple list thing.
House Stark- House Stark is one of the main ancient houses of Westeros. It was founded by Bran the Builder. Their seat of power is Winterfell. They Rule over all the smaller houses in the North, the Largest region of Westeros. They're one of the main focuses in the Story. The Main characters from House Stark are Ned, Robb, Jon, Sansa, Arya, Bran, Rickon, Benjen, Lyanna, Brandon, and Rickard. Their sigil is a Grey Direwolf on a field of white. Their words, or motto, is "Winter is Coming."
House Lannister -House Lannister is one of the main ancient houses of Westeros. It was founded by Lan the Clever. Their seat of power is Casterly Rock. They rule over the smaller houses in the West, The richest region of Westeros. They are also one of the main focuses in the story. The Main characters from House Lannister are Jaime, Cersi, Tyrion, Tywin, Kevan, and Lancel. Their sigil is a Golden Lion on a field of red. Their words are "Hear me Roar."
House Baratheon- House Baratheon is one of the Main houses of Westeros. It was founded by Orys Baratheon, they aren't an ancient house. They recently took the Throne away from the Targaryen's and are now the rulers of westeros, but they have another seat of power in the Storm Lands. Their seats of power are Kings Landing and Storms End, Kings Landing is where the oldest Baratheon rules the entire Kingdom and Storms End is where a younger Baratheon rules the smaller houses in the Storm Lands. They are also one of the main focuses of the story. The main characters from House Baratheon are Robert, Stannis, Renly, Shireen, Selyse, Edric, and Gendry. Their sigil is a blacked crowned stag on a field of gold. Their house words are "Ours is the Fury."