You should always begin with magician's Rod for his effect to search out opportunities to special summon "Dark Magician" as many times with "Magician Navigation", "Eternal Soul" and protect your board with "Endymion" and the "Mythical Beast" support. Keep your tributes for your "Darkest Diablos, Lord of the Lair" as your consistent special summon throughout the game to have that 3,000 ATK on the field as much as possible and for a possible chance in having both a poly and "eternal soul" for "Dark Magician the Dragon Knight" for an unbreakable board. The drawing engine is weak but it's good enough for a good hand. If a bad hand is to happen dont worry, the deck is built to become adaptable to any given situation. But blame the game if you start off with "reflection of endymion" lmao.
As for the extra deck... go try hard if you'd like to be honest. The only thing to keep in mind is your "Odd-Eyes Absolute Dragon" for its effects in both the field and the graveyard by summoning "Odd-Eyes Meteorburst Dragon". I think you know where I'm going with this(wink wink).