Well usually i make an item with wow-v's item creator as its much easier than this but it does result in the question marks..
If you want to get rid of them here is how..,
First load ADE ( i use the fixed version for 2.4 thats downloadable here)
second Load the Items tab..
Now.. heres where it gets tricky..
You need to find an item that has the Display id you want..
For this guides purposes im gonna to use the Crystalblade of the Drenai.
Change the Stats and Spells and Such to whatever you want and the name..
Leave the DIsplayid the same.
Assign it to a different Entry id # and then update...
If you cant get this to work correctly on your server You can Cannabalize the Item but leaving the Entry id the same too and it will work for sure but will Delete the previous item.(Ie no more Crystalblade of the Drenai)
I now have a Sword of Defiance(made of name) on my server with a Crystal blade of the drenai graphic in hand and IN inventory!!