You can't mod the console versions, only the PC version.
Willowtree is an xbox360 modding program
well there are many different kinds of websites but the one i use is called TheModdedgames.com
no
You can use a modding software for that. Download the mods from a Modification website and then use the modding software to install them to the game.
Yes. All you need to do is re-sync it to their Xbox360.
Yes, you can by modding your 'minecraft.jar'.
as long as you have 2gb of ram, which is how much Bethesda have restricted Skyrim to use on any computer ( without the use of a mod), you should be able to run Skyrim, mediocrely
Yes!
Well there is a lot but what i mostly use is blmodding.wikidot.com
id think so i know you cant use a cricket aircard on the xbox360 for xbox live
skyrim
Only by heavy, heavy modding.