First, whatchya wanna do is complete the daily foundry quest for 1000 Astral Diamonds (If you have none). Then make your way over to the Broker, go to the professions and leave everything blank besides the rarity and change it to uncommon. Look through all of the professions besides the packs and go to the last page which should have ingredients and components that buyout at 100 Astral Diamonds tops, and these items sell for 1-3 siver and sell in large quantities. Lets say you buy 100 Residium for 70 Astral Diamonds. You can sell the Residium for 2 silver and 50 copper each! Add that up and you got almost 3 gold already and the first mount is 5 gold! If your a visual learner I found a Youtube video pretty much showing the process with narration:
http://www.youtube.com/watch?v=8Ps_-uYvntE I did NOT make this video.