When using GFFEditor, you need to put what you want available to equip in the 'ItemList' area with corresponding details. That makes it available to the NPC and possibly to you, depending on whether you set the line 'dropable' to 0 (not dropable) or 1 (will drop on death). Here is an image of one of my custom made UTC files on GFFEditor.
http://i.imgur.com/PZk5A.png)
My advice is to use the UTC editor on Kotor Tool however, it's a lot less messy and if you aren't experienced, it can avoid unnecessary hassles.