This is the pretty basic history of my world Alethkar:

There are two gods that have existed since the beginning. Isten is the creator of everything. He is good and pure and beautiful. He dwells in Taevas, the place of the glorious dead, those who earned his favor and those who chose Isten over Aron. Aron is Isten's brother and is evil and is confined to Hel, the place of the inglorious dead: the place that humans/inhabitants call Alethkar. (Yes, Hel is Alethkar, they are one and the same...I am still working on the details of this.) Aron has power in Hel, has demons, and creatures such as Fenrir the great wolf.
Basically humanity came into being because Isten wanted people on Hel since it is habitable. He wanted people who would be able to do good and make Hel beautiful. Humanity was created dual natured, the father and mother of humanity being Idyn and Eve. Society started to go down hill as it grew. And in the modern day cities crop up and there are very few originals.

This is my basic history thus far.

Sounds good to me. The only thing I would point out is that you have some parallels to Mormonism by having your god-like figure related to the fallen entity.

If you are okay with that, then that's fine. I just wanted to make you aware of the similarity there.

It is? How so?

In Mormon belief, Satan (called Lucifer) is the brother of Christ. The second begotton.

That was the only thing.