Code:
Field1 - id (displayid for object)
Field2 - path (where is located model for that object)
Field3 Stand, SoundEntries
Field4 Open, SoundEntries
Field5 Loop, SoundEntries
Field6 Close, SoundEntries
Field7 Destroy, SoundEntries
Field8 Opened, SoundEntries
Field9 Custom0, SoundEntries
Field10 Custom1, SoundEntries
Field11 Custom2, SoundEntries
Field12 Custom3, SoundEntries
Field13-18 - locations you can put there 0 or copy like rest gameobjects have..
Field19 - ObjectEffectPackage only on those flying ships in Icecrown.

Now since you know what each field represent lets start editing.Shall we? [Only admins are allowed to see this image]

Start model viewer and go to World category/selection

For mine example i will try to make one object spawnable and that is db_red_dragon_shrine_leafs.m2

Very nice for some trees [Only admins are allowed to see this image]

First what i will do is open GameobjectDisplayInfo.csv and go to the end.
Then i will add in filed one one custom id(displayid)
100062 then in field 2 location to it
World/Expansion02/doodads/dragonblight/db_red_dragon_shrine_leafs.mdx
not m2 put there mdx
Lets see what we have
[Only admins are allowed to see this image]