This deck is very complicated. As such, I cannot give you a good combo line a what you "need" to do guide. All I can give are suggestions to an absolutely crazy combo deck.
Suggestion 1: make Beatrice, Lady of the Eternal a priority to get to. She is the key to accessing both the Zombie and Branded engines. On your turn, mill Despian Tragedy, add Aluber the Jester of Despia, Normal Summon him, add Branded in Red. On your opponent's turn you can use Branded in Red to get Guardian Chimera. On your opponent's turn, durring their Draw Phase, send the missing Zombie piece (Necroworld Banshee or Doomking Balerdroch) to the GY (Banshee is a Quick Effect, Balerdroch Special Summons himself during the Standby Phase). You will have hopefully milled the other piece off of The Zombie Vampire or Immortal Dragon.
Suggestion 2: Go for Power Tool Braver Dragon before Virtual World Kyubi - Shenshen, and never have both on the field at the same time. If you do, you can't use Braver Dragon. Braver Dragon is also a free draw two, hence why in tight resource states it's invaluable.
Suggestion 3: Don't go for the Zombie side if Zombie World is in the GY. It's useless at that point.
Suggestion 4: You can make Baronne de Fleur using Aluber and other sufficient material.
Suggestion 5: You can make Crystal Wing Synchro Dragon off of Immortal Dragon and Stardust Charge Warrior.
Suggestion 6: Have fun!
This deck is only around $270 USD, but you can make the price about $60 USD by making the following changes:
Do what you prefer with the Side Deck.