More like "not at all."
Call me lazy, but I just don't have time to read all the lore on TES at the moment.
There's a couple places to do it quick. I'd suggest the http://imperial-library.info/content/pocket-guide-empire-third-edition-all-eras-man-comprehensive-history-our-history, and the slightly more detailed Lore Buff Guide's http://www.gamesas.com/topic/1112211-how-to-become-a-lore-buff/page__p__16312385#entry16312385.
Tamriel was a 'Mer' nation and this was the Merethic Era.
The mer had the civilizations, but there were plenty of aboriginal human tribes, too.
Ysgrammor and his people came from Atmora from the north and landed in Skyrim but was defeated, Ysgrammor came back with 500 Companions and defeated the elves into hiding. He then formed Skyrim and since then the humans have settled the lands. This is the Dawn Era
More or less, but it's the early 1st era, rather than the Dawn. The Dawn is the mythical creation of the world.
Now sometime the orcs become disfigured, follow Malacath, and something happens to the Dark Elves too.
The Orcs turned into Orcs back in the Dawn, when their god, Trinimac, was transformed into Malacath. The Chimer (which look like High Elves) turn into Dunmer in the 600s of the 1st era, after an epic war with the Dwemer.
Talos is a Nord and unites the entire land under one rule, the Empire which rules during the 1st, 2nd, 3rd, and the 4th Era. But when Talos died back in the 1st Era, he was such a badass he literally became a Divine.
Talos' race (and identity) are disputed, and his divinity is too complex a matter to cover here. His Empire ruled the 3rd era only. The 1st era had the Alessian Empire, started after men rebelled against the Ayleids, and the Reman Empire, founded by Reman Cyrodiil. The 2nd era was ruled by remnants of the Reman Empire under the Tsaesci (Akaviri) potentates.
if you want to learn basic lore without going through hundreds of books you might consider listening to these podcasts
http://elderlore.wordpress.com/episodes/season-one/
they are lacking in detail and are at times inaccurate, but is still great backbone for someone in the learning phase
(it would help if some of you loremasters had a look at this, i'm currently using these podcasts to get my lore together but i'm unsure if they are any good)
The problem with podcasts and videos is that, unlike print media, they cannot be easily edited. Those inaccuracies can lead to a lot of misunderstandings, like inaccuracies in wikis do, but unlike wikis, we cannot go back and fix them. Even if we listen to all of them, and bother correcting every problem, the problems will remain.
If I may ask, why do you (general you) prefer podcasts to reading? Is it just a multitasking thing?