The fastest way to make money is to farm crafting materials and sell the refined mats and gold tempers. Along the same lines would be farm alchemy reagents, which the right ones can fetch a nice price for even a stack of 10-15. Lady Smock, Corn Flower, etc. After that if you have a thief you can pick pocket in Vardenfell, the motifs still fetch a good price, 10-20K each depending on the style. Plus all the picking will net 4-6k on just the looted treasures. All of the above will require a guild trader just to maximize profits, you can accomplish via zone chat but its hit or miss. Doing the above I stay at 700K +/- gold at all times.