For all those lower levels who are struggling for some gold( and by lower lvls I mean 16 - 24ish) probably the best way to make some gold is to skin.
when you get the skinning skill go to Dun Morogh and the Wendigo cave there you can just walk through it a few times killing wendigos, looting and skinning, or you can follow a lower level through helping them kill the Wendigos then Skinning them.
Once you are about skinning lvl 50 - 60 you should go to Westfall and look around for the lower lvl Goretusks (lvl 12 - 13) and Coyotes (lvl 10) after getting your skinning up to around 70 - 75 go looking for the Greater Goretusks (lvl 16+), If you want now you can get the next lvl of Skinning.
Once you are up too lvl 70+ head to Redridge where you will be able to skin the Greater Goretusks which are around the Gryphon’s and near where Bellygrub is, at about lvl 80 you should be able skin the Tiny Black Whelplings.
Now that you have all this Light Leather, Medium leather and Hides, you might be wondering what should I do with all this? Well you have two choices, you could get the Leatherworking skill and make items with this however this takes time and leather to start making gold. The other choice you have is to simply sell it on the Auction House, prices will vary depending on the server however I usually sell the Light Leather for 70s a stack and the Medium Leather for about 50s a stack.
So there you have it an extremely easy way to make some gold while you lvl up. This gold should help you upgrade your gear for a few lvls and you should be able to get up a few lvls from doing this. Have Fun!