What does Going, Going, Guano! reward?

No reward has been recorded for Going, Going, Guano! yet.

Where does Going, Going, Guano! start?

Master Apothecary Faranell in Undercity offers it.

The quest log lists it at level 33.

No. The quest exists in Classic Era as well.

World of Warcraft: Forever · quest · level 33

A level 33 quest in World of Warcraft: Forever, offered by Master Apothecary Faranell in Undercity. Recorded by 1 player running the addon.

Pay shows once a player with the addon opens the quest.

No reward item has been recorded for this quest. The offer window fills this in when a player with the addon opens it.

What does Going, Going, Guano! reward?: No reward has been recorded for Going, Going, Guano! yet.
Where does Going, Going, Guano! start?: Master Apothecary Faranell in Undercity offers it.
What level is Going, Going, Guano!?: The quest log lists it at level 33.
Is Going, Going, Guano! new in WoW Forever?: No. The quest exists in Classic Era as well.

What sells at this level, and what to keep from these rewards, is in the level 30 to 40 gold guide.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Undercity