In spires of arak, get the smuggler, it sells rare things (like pets, and massive bags)
In Nagrand, the siege workshop is massively more useful than the wolf thingy, the tank does a *lot* of damage, and takes no fall damage, so that's fun.

In your garrison, it's worth having;
Salvage yard - Lets you get salvage from follower missions, better stuff comes from higher levels, can get BoEs that go for a lot of money, otherwise, good 100g/day from this, 0 effort.
War Mill - Lets you trade garrison points for follower gear
Lumber mill - Cut trees down, get garrison points.
Stables - Level 1 stops you getting dismounted, but it's worth levelling it to 3 on something, for quests for extra mounts