I also don't have a clue what to do in these parts. I got SQLyog and have managed to get it working but not really sure how to use it, up until now I have only been making custom weapons and just importing them with MySQL as they were. I haven't had to edit anything. Using ArcEmu at the moment. So far none of my attempts to make an NPC or Vendor have imported into the game correctly.4). Save the WoWHead Link of the NPC and write &xml besides the Link.
5). Then there should be a column called: <icon displayId="ID">
6). Copy the Numbers between the; "
7). Remember to save the Number!