There are several things to remember so you can maximize your gold earning potential with being frugal at the forefront. Always carefully consider your purchases so you do not waste more gold than you need to for example, on a weapon you will replace in two levels. If new equipment is right around the corner try to hold out until you can use it.
Between levels 60 and 70 the quests alone will bring you 1,000-2,000 gold depending on how much you may spend while leveling. Remember to be thrifty and you will be one step closer to your flying mount the moment you achieve level 70. It is very easy to achieve 100 gold per hour while questing in Outland and 5 gold for just a couple of minutes of hunting mobs.
Try to not skip purchasing the regular flying mount, it may be slow but the advantage of soaring over the land and easily collecting tracked herbs and ore is much easier this way than running through groups of angry mobs and possibly suffering that expensive repair bill.
Make a level 5 bank character and give them leatherworking and enchanting. The reason for this is so you can have extra bank space, have them placed in a major city while you are in Outland so you don’t waste a lot of time going back and forth, leatherworking to turn Ruined Leather Scraps into Light Leather and enchanting to disenchant any low level items you may get while farming. A lot of players overlook the utility of having a bank to post your auctions with but once you start doing it you will see the gold roll in much faster and your time better spent acquiring wealth with your main character. This is also very helpful for new characters and having gold at lower levels, not only do you level faster by making more use of your time but you make use of otherwise useless items.
Try to avoid BoE Epics as these are rather pricey and can be easily replaced most of the time. Some of these epics are like low usage blues and should be avoided in most cases. There is usually gear from instances close to your level that are BoP blues and are better than most of those epics available to you at that point.
Scams are everywhere in World of Warcraft and you should try to avoid these at all costs, this includes some CoD (Cash on Delivery) items, be very cautious with CoD!