In order to find Herobrine the world generator seed must be "Need Water" with capitals and spaces.
Step 2: Spawn Point
Here is your spawn point. Get the sugar canes to make paper, books, bookshelves for decoration.
Step 3: Herobrine's island
Look for this specific island throughout the map since here is where herobrine lurks...
Step 4: The Entry
This stone block is where everything starts. When you break this block, you will find a room underneath. If not, dig deeper all the way around this stone block. There will be a painting in Herobrine's room and you will need to walk thought it. You should enter a mine or a second chamber, where Herobrine will hunt you down. Good luck everyone and since this is a DIY, Do It Yourself before asking me to send proof.