Why Skinning? Skinning is incredibly easy to level up while you are leveling your character. The leather that you skin will almost always sell on the Auction House (albeit not for much, but hey– it’s free gold!). Even if you don’t want to take the effort to sell the skins on the Auction House, you can simply vendor them for a significant amount of extra gold.
I'm happy to see them really committing to this. I didn't think I would be all that interested, but I will sure give it a go. Personally I wouldn't mind quality of life improvements and most of my friend don't really care for a 100% authentic vanilla experience but they want the old zones and world, a game world pre-Cataclysm but have no requirement for it being "authentic" to World of Warcraft Patch 1.12.2.
Where to get materials and reagents you may ask? Buy for cheap off farmers in bulk or track Auction House lots. Get in touch with most big sellers. Communication is important here, send a whisper or write them a letter. It would be good for both of you to establish business relationships. Constant suppliers and buyers is convenient for both parties to save the time and effort.