Imo these proffesions are easiest and best for fast gold and a nice proffesions bonus (like Flask of the north from alchemy and jewelrcrafter gems). Also u can mine lot of usefull things which u can use for alchemy (eternal fire,air,earth,chalcedony,bloodstone etc). And mining is usefull for alchemy because you can make saronite bars, and then later transmute them in titanium bars. Also with alchemy u can daily transmute 1 cardinal ruby or other gems wich u need for jc. These proffesions working great together because for alchemy u need herbs to make flasks and potions and for jc u need mining.

My sugestion for choosing proffesion is on your main you should have Alchemy and Jewelcrafting, and then you should make an alt with gathering proffesions like Herbalism and Mining. Just 2-3 hours a day and for a week or two you can reach the gold cap. I made this guide for palyers who have around 2-3 hours free wow time. Gold is everywhere around you just waiting for you to pick it up :)

I see lot players on Warmane strugle to earn some gold.