Why killing if you can just cleanup mob corpses slain by other players? Grind rep. with Son of Hodir. The daily quest cave is what you're looking for.
If you're farming uncommon leathers, go for the dragon scale @ S. Basin, or nerub chitins @ Argent Vanguard (if you didn't turnin the quest of Argent Crusader) or Zul'Drak. Forget the worm scale, just sell it to NPC for 1g per scale.
As for the borean leathers, selling them to NPC maybe the easiest way to make money now, since the requirement for borean leather is minimum besides leatherworking. However, if you have mining + leatherworking + enchanting, you may wish to try dark iceborne.