I know it's not a lot of info, but this pretty much covers it. Start with about 1g in your pocket, 8 hours worth of your favorite attention span enhancer and a lot of empty bag space then take a hike to the superior fields north of Hobbiton. Almost anything you'll ever need for farming, except improved tools (which don't effect the results), can be found there.
At about the point you are ready to faceplant your keyboard from boredom, you'll be a GM farmer. Most of that 1g will be spent to buy the "recipes" for the fields/items that aren't part of the default set. Don't buy them until you can write them or they will just clog up the bag space which you will need for crops, seeds and fertilizer.
Edited, Oct 13th 2008 4:34pm by Kitca