No, you do not need to restart Skyrim when buying a new DLC. Once you purchase and download the DLC, it becomes available in your game automatically. You can access the new content in your existing save files without having to restart the game. Just make sure to load a save where you're able to access the DLC content.
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No, it is paid-for DLC.
your mother.
Only on PC by downloading the Skyrim Online mod on the SkyrimNexus and there will be a Skyrim online DLC in 2013
Yes. It's DLC.
Yes, but only if you get the Hearthfire DLC
Very soon, be patient.
19.99 USD.
You have to buy the DLC
Yes.
You can't have any children in Skyrim without the Hearthstone DLC or installing mods.
Skyrim DLC for PC is out as of 8/2/2012 in the Steam Store.