World of Warcraft: Preparation Guide

What you need to do to prepare for World of Warcraft: Shadowlands. 

1. Sort out how many characters you are going to play / level. 
2. Park your character outside either Grommash Hold (Horde) or Stormwind (Alliance) to start the Through a Shattered Sky questline.   Here is a link to the questline at WoWhead. 
3. Equip 5% and 3% move speed gems.
4. Equip Light-Step Hoofplates for 20% increased mount speed. 
5. Grab 80-100 Goblin Gliders.  You will use these primarily in the Maw.
6. Grab 2 or 3 Draught of Ten Lands for a 10% experience bonus up to 51.  Getting ahead of the crowd will save you time later. 
7. Clean out your bank and bags.  
8. Enable Warmode for the 10% experience increase. 
9. Grab 40+ flasks.  
10. Grab 120+ HP potions.  
11. Grab speed and dps food. 

You're good to go!