World of Warcraft Classic is a faithful recreation of the original World of Warcraft—it runs a bit smoother on today’s computers, but the game still looks and feels like you’re playing World of Warcraft from 2006. Below you can find profession leveling guides for every profession in Classic WoW.
The leveling guides are for Classic Era, HC, and SoD realms! Use my WotLK Classic Guides if you play WotLK Classic!
SoD Profession Changes and New Recipes in Phase 3
Alchemy
Blacksmithing
Enchanting
Engineering
Leatherworking
Tailoring 
Herbalism
Mining
Skinning
Cooking
Fishing
Fishing and Cooking
First Aid 
Lockpicking
Blacksmithing
Engineering
Leatherworking
Copper Ore
Tin Ore
Iron Ore
Mithril Ore
Thorium Ore