I am a lvl 80 Blood Elf DK and I am sick of having low amounts of gold, I am also sick of seeing people charging money for gold guides. If there is anyone who knows good gold tips and feels the same way about gold guides put your tip here and I intend to make my own guide free of charge.

"quests, professions, dailies & working the ah
quests give g when maxed @ xp
professions give you stuff to sell (gathering prof can be more profitable, but check w/ your ah for which is more profitable/you would have more competition w/. mining & herbing are both used by more then 1 prof, but that means more people may be doing it too. skinning is nice b/c you don’t have to look for spawned nodes. if you already have a service/producing prof lvl’ed advertise. Learn all the recipes you can, esp the rare/epic ones & let trade know you know them. & if you go mining, sell that titansteal cd everyday. 10-30g for that is often advertised as wtb in trade on my server.)
dailies, I like the tournament ones & the bonus w/ them is that you can use the champion seals from them to buy pets to put on ah. for those pets you can get more on the blackwater ah (neutral) then the faction one b/c the other side wants those pets but must go through there to get them vs potentially getting them themself/from a friend.
when running around loot everything, even vendortrash can be worth a few g. crappy greens sell to those lvl’ing enchanting. learn who will pay what for what." ~ my answer to another question a month ago
With the new looking for dungeon system, you can even make g running random heriocs & get badges too. A # of people I know sell epic gems on ah that they buy w/ honor or badges (depending on their prefered method of farming.)
what’s your professions ?
you could make some gold from it ,it really helpful
my hunter learned two gathering skills and works for me very well
or you could go to buy some gold as well .its cheap, coz its x mas period