To start Farming, You'll need to use the teleport spell ::seeds
Now that you're here, kill the chaos druids for seeds and vials of water. They drop 1 of each every time.
After you have a decent amount, go to your spell book and select Catherby teleport.
Now that you're here, run east.
You'll soon see a patch of grass that says " Fruit Tree Patch"
Use your seeds with it to make Herbs.
Use the herbs with the vial of water to make potions.
I'm sorry that I couldn't get the levels required to make each herb and potions.
Good Luck and have fun
*EDIT*
Okay I didn't really find this out until today so mybad.
To train herblore easier, go to ::skill and talk to Yrsa
You can buy herbs and vials of water from this shop.
Noted vials of water can be obtained from Nurmof.