Dawnguard is basically an expansion pack for skyrim. like all expansion packs, it requires the base game to play. So on a PC (and any other gaming device) you need skyrim first and then you can install dawnguard.
No, you just need to be level 10 or higher.
Skyrim DLC for PC is out as of 8/2/2012 in the Steam Store.
Xbox 360 has been you for a while. PC is out now PS3 is not out that I know of.
It is out already for Xbox 360. The PS3 and the PC version have not had their release dates announced yet.
No, it is paid-for DLC.
Dawnguard will be released on the Xbox 360 on June 26 and for the PC on August 2. Because of performance issues, release for PS3 is still postponed.
It is daedric armour!
It costs £12.99
Dawnguard was released for; - Xbox 360 on 26th June 2012, - PC on 02 August 2012, - PS3 on 26/27 February 2013.
Skyrim for Pimps - 2011 Dawnguard Begins 3-1 was released on: USA: 1 August 2012
Assuming you mean for the PC, most good game stores should have it, like GAME.There is no disc version for XBox360 or PS3.
February 26th 2013.
By purchasing it and installing. Different consoles have different methods.