Currently, I have several level 90s at my farming disposal, each with their own 16 plot farm which I use every day. Sunsong Ranch is a great way to make a lot of gold pretty quick… If you remember to do it every day <looks in direction of Nimrasil, who is too busy PvP’ing to farm>.
Since I have all professions, I will give you here an idea of how I do, in the hope of inspiring you. You too, Nim!
Priest – Alchemist (Transmute Spec)/Jewelcrafter
My priest is using Bag of Enigma Seeds for the herbs and the Snakeroots for the stones and gems. It is much quicker to get Trillium to prospect from the farm than from flying around farming. Sometimes she goes to make Spirit of harmony instead of stones and herbs and crafts primal diamonds out of it. A very easy and neat way to make from 300 to 400 gold in profit.
From Enigma Seeds, you can get any Pandarian herb, often, you get Golden Lotus (very useful for my stone transmutations). My priest keeps the Golden Lotus and send the other herbs to my scribe to mill and turn into inks. I generally keep the Fool’s Cap too and let my AH-char post them. They are selling very well, especially in week-days.