Apprentice (1-75): 
Stormwind, Ironforge, Darnassus

Orgrimmar, Undercity, Thunder Bluff
Journeyman (50-150): 
Stormwind, Ironforge, Darnassus

Orgrimmar, Undercity, Thunder Bluff
Expert (125-225): Buy
[Expert First Aid - Under Wraps] from

Arathi Highlands:
[Daneb Walker]
or

Dustwallow Marsh:
[Balai Lok'Wein]
Artisan (200-300): 
Dustwallow Marsh:
[Doctor Gustaf VanHowzen] Quest:
[Triage] 
Arathi Highlands:
[Doctor Gregory Victor] Quest:
[Triage]