This is the guide I been following:
http://home.mchsi.com/~sicboy/MyGuide.htm
I'm lvl 70 Goldsmithing an its been a long road geting here. I'll tell you how I did it, which may different than a lot others but it worked for me. Over 3-4 months I added mules to my account, they are only a $1 and a well worth it. I now have 10 mules + my main, I pay 25.95 a month for the account an have my mules spread out in the 3 smaller citys an 2 in Jueno. I used those mules to grow Ice Ores as my main sorce of gil. I farmed the tree saplings and planted an waited for harvest time twice a month an bought all my gear an lvl up goldsmithing too. Since I'm talking about Ores heres a link to the best way how to grow them:
www.ariah.curiouss.com
Anyways goldsmithing is not very profitable an I never made any gil at it at all untill I seen at lvl 60 I needed to make Platinum Ingots. I seen that I could grow the platinum nuggets, so switched to useing 5 mules to grow them. Well when I started synthing them an looked at the AH price for a stack was 1 million gil(valefor server) I finshed skilling up and switched all my mules to growing Platinum Niggets as my main sorce of gil. After paying for some other materials(platinum ores, fire crystals) I currently make about 7 Million gil every 12 days. I just lvl up from 68 to 70 useing the 7 stacks of platinum Ingots, synthing them into Platinum Rings. 7 Stacks wasen't enough, so I bought 4 stacks of Gold Ingots. Synth them into 2 moon rings, an used the rest to synth Torques. This is crazy gil. The current price of the Gold Ingots are about 700K + the stacks of Platinum Ingots (worth 7Million) Thats a little more than 10 Million.. Good thing I grew the Platinum otherwise this would be out of the question as far spending the 10 Million Gil to get 2 lvl's. Good luck, I think its the hardest Craft to skill up.....