If using talliis, you'll have to go down to the strings table and add the information, then use the number that your string has been assigned (automatically) and put that in the table.
I recommend MyDBCEditor, you can find it in Tools and Resources - it will all become clear
If all else fails,
http://www.wowdev.wiki/index.php ... ayInfo.dbc say that the path of the model should be in column #1 and the path of the texture should be in column #3
Column number 1 will always be an entry, 2 and 3 are the model paths, 4 and 5 being the textures (if using two models, such as shoulders, but if only using one model refer to columns 2 and 4). Column 6 is the inventory icon.
If you are adding weapons alone, that should be it.. if you're adding armor pieces, you'll need to assign the textures manually in the right columns, probably need a bit of trial and error (I suffered big time with this a year or so ago when I ported 20 cataclysm sets and added the dbc's manually /*KILL ME NOW */...)
Any other questions or problems, don't hesitate on asking
Soldan