A new quest will pop up once your first pet reaches level 3. It will send you to either Audrey Burnhep in Stormwind or Varzok in Orgrimmar. These trainers will offer a quest chain to battle specific Pet Tamer NPCs on each continent. Defeating each of these NPCs will reward a nice chunk of experience for your pets, as well a Sack of Pet Supplies (which has the chance to drop the Porcupette companion, among the always-useful pet bandages).
I highly recommend actually staying in the 20-60 range zones until you ding 62. The reason for this is that despite getting a slight penalty in experience for being over-level, the advantage of having flight will more than offset this. That, and WOTLK and TBC zones are the slowest part of the leveling process. Minimizing your time there as much as possible is worthwhile.
Another potion of treasure finding farm that was made extremely popular by the YouTuber Oldbess. In this spot, you are simply to patrol the entire southen river basin in Twilight Highlands, just around the Verrall Delta area. The goal of this farm is to kill water elementals for their volatile water, which trends around 50g per drop. Combine this with the cloth and the treasure chests, and you have a cool nifty farming spot – thats rarely populated these days.
Blizzard has taken steps in recent years to smooth out out the leveling experience — Legion allows players to immediately boost one character to level 100, for instance — but if you want to roll multiple characters without spending money on multiple level boosters, you’ll need to spend time leveling. Thankfully, with the right maneuvers, it’s possible to level a character to 110 in a relatively short time. Here are some pointers for leveling in World of Warcraft, so you can rush through old zones and explore the new.
If i start on a new realms, I am farming a lot of transmog from classic and Burning Crusade Dungeons and Raids. In the beginning, i start to post them if they have at least a DBRegionMarketAvg (Average value of an item on all EU realms of the last 14 days) of 500 Gold. All the other items get vendored. The time you hit a stock of 1000 Items, my value treshold raises to around 2.500 Gold. All the items below that value get vendored aswell. Newly farmed items that are above these treshold will be listed. Why? If I start over somewhere, I want to get a certain amount of gold quickly. Cheap items are great for that. Later on, to save time, Quality is better than quantity. As mentioned above, re-posting the items on the auction house takes quite a bit of time. At this point, I can recommend you the TradeSkillMaster AddOn, it makes your auction house work really a hell of a lot easier.