Not a fan of Leatherworking.
On face value it looks good "I wear leather so I can make my own gear" but it seldom works that way. Unless you pair it with skinning, or have a skinner, then you have to buy mats (not overly a bad thing) but still eats into your "savings". Then factor that it's only 1 or slots per tier, if you're a hardcore raider you'll replace it with heroic gear, and if you're not hardcore, then why worry about the crafted gear, just wear what drops.
As for making money, well you can sell the crafted gear sure, but other professions will make you more.
Personally, I'm probably going with Inscription/Tailoring.
Inscription because I don't have one, and it will reduce my own costs by making my own shoulder enchants and Monk Glyphs (seriously, scribes will MILK these).
Tailoring because it's a gathering/crafting profession in one (cloth scavenging). I've made a fortune in Cata from Cloth farming and I plan to continue it. Also, bags sell well, and a few more self enchants (although no leg enchant apart from Mistweaver) will also keep personal costs down.
The real money makers (JC/Enchanting/Alc) I have covered by my Banker and my Alt and see no need to level another one on my Monk.