For Alliance it's Lok'Modan, Redridge, Darkshore, Felwood, Stranglethorn (both parts), Plaguelands. Somewhere between 3 - 3.5 of these get you to 60 in like a 16 hours /played, if you queue for dungeons at the same time. I recommend dropping everything at 45 and going to Darkshore-Felwood if you didn't do them yet - they are literally the fastest levelling zones in the game right now, maybe only trumped by Silverpine.
If you are looking for some solid information on fast leveling in wow and you want to plunk down the dollars, you should take a look at Zygor Guide. One of the first great features you notice is that this guide is available for both Alliance and Horde while other guides are horde or alliance only. That's why Zygor Guide sets itself apart from the crowd. The absolute best part of the guide is the map add-on. Once you have loaded up the mapmod, it makes it very easy to follow along with Zygor Guides in a step-by-step fashion. You won't need to press alt+tab aveytime you need to find your next step or coordinate. Everything is inside your game.
Leveling you character is very complicated process in world of warcraft. Many players need several month or even years to get to level 70. But what if you don't want to waste all your time playing wow so much but you still want to get to level 70 and be better than your wow friends or enemies? Than you should use special wow leveling guides which will help you to get to level 70 as fast as possible. That's why I picked up Zygor Guide so that I could maximize my efficiency while leveling, so that I can keep up with friends who have more time to play. In this article I will tell you more about this guide and its main features.
Blizzard also has a great New Player’s Guide, split into four major sections, as well as its “A Return to World of Warcraft” compendium. And be sure to check out Blizzard’s online forums, especially the New Player Help and Guides forum, where you’ll be able to find more information, ask questions, and engage with some of the World of Warcraft community’s most helpful members.
Patch 8.1 has introduced new reputation items that can be purchased using Seafarer's Dubloons earned in Island Expeditions. These items can be purchased for 100 of the Seafarer's Dubloons and grant 250 of the reputation linked to the item purchased. This can be used as a great catchup mechanic for reputations needed for the primary reputations in Battle for Azeroth. The specific items can be found in each of our reputation guide pages.
DoTs: Assuming that the mob is going to live for certain periods of time, it is worth it to place DoTs up. If the mob lives for at least five seconds, cast Pain. If it lives at least seven seconds, cast VT. The ideal time to cast DoTs is when it would be replacing Flay, but you can substitute Blast if the mob will live longer. Make sure to cast Bolt on cd though!