Sky Dragon was in Tournament Pack 2, which has been out of print for over a decade. Your best bet would be to look for it on eBay. get it from yugioh: legendary collection. it is also available in a hard to find yugioh pyramid of light comic, and was available as a shonen jump promo.
There are two movies. One that came out only in Japan based on the original series and the other, Pyramid of Light, that came out in the U.S. as well. Yugioh Wikia: http://yugioh.wikia.com/wiki/Movie
None of those cards are really worth much.
Yes. Pyramid of Light
yes
Joey's opponent sacrifices Fenrir and Inpachi to Tribute Summon Maju Garzett whose ATK value becomes 3000 with 0 DEF.
You have to beat Aster's story
Yes, both will be destroyed.
Best place to watch any episodes of Yugioh, Yugioh GX, Yugioh 5D's, and Yugioh Zexal is at the website 4kidstv.com
Pyramid of Light, Andro Sphinx, Sphinx Telaia, and Thinein the Great Sphinx.
Series after: yugioh 5'ds is yugioh Zexal.
No, but there is a card similar called "Armytile the chaos phantom"