Ok, i try to explain you how to add ("batch") things into you're Database.
Sorry for my bad english, but i came from germany ^.^
Ok, so at first you have to create a Item at

. (Account and this things needed)
Start creating you're weapon, for example
When you've finished you're weapon, klick on
Submit and then on
Download (both on the end of the Page)
Then you have to look for the MaNGOS - Download.
After downloading, start the server and login to the Database (with Navicat, you know? ;D)
Then open the
World table,
Rightclick on it and search for
Execute SQL File
in the new Window you choose you're selfmade item (
Name - Entrynumber.sql and click on
Start. wait until the item is batched into the Database, close Navicat and restart you're Server.
After restart you can add the item to you're (ore others) inventory, and to vendors for selling, by the EntryID.
This Tutorial will also work with Loot, Graveyards, NPCs and Quests
I hope i've helped you =D