Setting back an account requires a save, if something has happened on your account then just revert back to your nearest autosave, if no saves are available then nothing can be done.
It's basically about the high king's murder and dragons returning back to Skyrim.
Skyrim is the name for a province of Tamriel in the Elder Scrolls games, and the name of the game specifically set there. There are no other Skyrims.
Yes, you can.
Extremely unlikely. Each Elder Scrolls game is set in a particular realm of the Elder Scrolls world. Morrowind was set in Morrowind. Oblivion was set in Cyrodil. Skyrim is set in Skyrim. Unless Bethesda break the pattern that they have set or decide they want to create more events in Skyrim (Likely to be a DLC rather than a new game). Another Elder Scrolls game wont be out for another 2 - 5 years. Might as well as play Skyrim for the time being.
Skyrim
The Deathbrand set is just an enchanted set of heavy Stahlrim armour.
You don't need to buy Skyrim from Steam, but it does need to be linked to your Steam account (by registering the serial code you should have got with the game).
Account set up for transactions between companies to charge back expenses occured by one company but relate to another company, which you charge back to. BM
No, using the code permanently adds Skyrim to your Steam account. If anyone else tries to use it, it will say it has already been redeemed.
No, After you leave it is impossible. unless you're on PC.
Unfortunately, I don't think you can
Tamriel is the name of the continent the Elder Scrolls games are set on, all Elder Scrolls games have been set on it, though we know the names of other continents such as Akavir and Atmora. Tamriel has 9 provinces; Black Marsh, Cyrodiil, Elsweyr, Hammerfell, High Rock, Morrowind, Skyrim, Summerset Isle and Valenwood. 'Arena' let you visit every province in Tamriel. 'Daggerfall' was situated in part of Hammerfell and part of High Rock. 'Morrowind' took place in Morrowind, more accurately in just the central island of Vvardenfel. 'Oblivion' was set in Cyrodiil, the empire's capital city. 'Skyrim' is set in Skyrim.