Some general gold making tips:
-- First,I don't recommend scamming people. All the gold in Outland can't buy you out of a bad rep.
-- As the previous poster mentioned, Auctioneer/Beancounter addons (they work well together) help tremendously. Bottomscanner will help you find good deals on the AH.
-- I DE'd a lot of my crafted goods as the enchantment mats sell better on my server than the items themselves. So if you have to make 15 of some common item to up your skill, you don't have to vend them or sell them for next to nothing.
-- Dedicate an hour or two every few days to farming. When my first char was in her mid 30's I duoed SKF/WC a few times a week for skins/BoEs/gold with a friend. I had more than enough money to buy my first mount without having to sacrifice equipment upgrades/enchants/training. As long as one of you DE's, you and your buddy can either alternate or roll for the shards on unwanted BoP items. Two low lvl 40's characters (especially if one is serious DPS and one has some healing ability) should be able to duo everything through RFK with enough safety and speed to make it very profitable.
Alternatively, I found the were-creatures in southeast duskwood to be a great place to farm when I was saving for my first mount. I could kill them en masse with ease (one criterion of a good farming mob), they dropped cloth/silver in abundance, and I could skin them for leather. My Herbalist friend farmed in the Swamp of Sorrows because the humaniods dropped cloth/silver and there is apparently an abundance of herbs there, though the mobs are a bit tougher than duskwood.
-- Buy big bags; they will pay for themselves in the loot you do not have to throw away. Keep them empty of your crafting gear. No reason to carry thread or herbs around with you. Ditto multiple stacks of consumables. If you will not likely need 80 bandages, then leave some in the bank. Buy a bag slot for your profession bag and just switch it for one of your empty bags when you are ready to do some crafting.
-- Pick up everything, even if it is just worth a few silver. Every copper adds up over the course of 70 lvls. I see SO many people that will leave grey/white items behind, especially in dungeons. I pick it up and profit from it. Again, this is where your bag investment pays off. (I averaged 3-4g per run through BFD in vendor trash alone.) If your guild has a tailor that can make 16 slot or bigger bags, that'll save you some gold (assuming you can get the mats cheaper than the bags sell in the AH).
-- On that note, you can save a lot of money by joining a good guild. The pooling of resources means that you will have access to whatever profession you need, and guild crafters normally do guildie stuff free if you bring them the mats. This can save you a fortune in gear, enchants, bags, pots, etc. Remember to reciprocate generously when you can. No one likes a moocher.
Also, guild enchanters can DE the stuff you can't sell (assuming you cannot do it yourself), giving you enchanting mats that will sell. :) This is sometimes a better option than repeatedly putting the same thing up over and over, as there is no cost to auction enchanting mats.
Hope all that helps some. Best of luck!