No, you can play Dawngaurd anytime durig the story. Its is recommended that your character is level 10 or above to play the Dawngaurd story, but it is not a requirement.
Only on PC by downloading the Skyrim Online mod on the SkyrimNexus and there will be a Skyrim online DLC in 2013
No, it is paid-for DLC.
your mother.
Yes. It's DLC.
19.99 USD.
Very soon, be patient.
Yes.
Yes, but only if you get the Hearthfire DLC
You have to buy the DLC
Skyrim DLC for PC is out as of 8/2/2012 in the Steam Store.
You can't have any children in Skyrim without the Hearthstone DLC or installing mods.
As of July 24th, 2015, no.