You create these tables yourself, and no you don't need to download anything.
You actually might not even need to make a table, it was just some way for you to keep your stuff sorted.
Get the stats from the tooltip, compare these stats with your weight, if the stats comes out as something you'd roll on, then roll on that item.
Do you HAVE to make it an wow item? Can you not skip this alltogether? I personally haven't used wrobot to roll.