I would not even consider farming until you are:
1. A lvl 20
2. Completed the game, all of them if you have them
3. Have all the attribute points
4. Have all secondary profession unlocked
5. Have lots of skill unlocked
6. Visit the Campfire forum on this site or PVX
http://pvx.wikia.com/wiki/Main_Page
7. Know why you are farming, ie.. money, materials, greens, golds, tomes, etc
(no sense in farming unless you know what you need or want)
Just play through the game for now. You can worry about farming later, trust me it gets boring. Have fun and play while the game is still new to you.
PS. Rangers are horrible farmers. When you do get ready to start farming then I would make a monk, ele, or assassin for farming.