In my opinion, the best Structure Deck is Dragons Roar. It is a simple deck, based on the Red-Eyes Darkness Dragon with Armed Dragon support and a few smart spell and trap cards thrown in. Very easy to tailor it to your own style, and being a Dragon deck (dragons seem to be quite popular) it is easy to find the cards that suit your deck from the couple hundred of dragon cards that are out there. I started with this deck, it taught me about strategy, and how to win with effects, rather than just winning by superbly high attack.
The best deck is the Surge of Light deck. When Neo-parsah is summoned, with the help of the field card "Santuary of Light", it can do damage differences between its attack and the defense of the opponent's monster. Not only that it can raise its attack by the difference of the life points of the players. Other monsters in the deck have high attack power and pretty good effects, despite their low levels.
ebay
Go to yugioh-card.com to learn the rules. You can also get a rulebook in each structure deck and a "beginner's guide" in each starter deck.
Get the warriors triumph structure deck and improve from there.
exodia
phantom of darkness labryinth of nighmer invasion of chaos wierdly some ancient sancturary
You can obtain Junk Warrior by getting the structure deck which it's in. It's in the Yugioh 5ds Starter Deck.
The best deck for this card would most likely be a beast or an EARTH deck.
The best Yu-gi-oh player is Yugi because he started and has the best deck!
A good and cheap Yu-Gi-Oh deck that you can make for under 70 bucks is the Samurai deck.
The best deck to stop kagemaru is one that does damage to him when he use's any of the three decks.
bubble beat
The card "Zombie World" is only available in the Zombie World structure deck.