Lets say you make a human mage because you want to troll other people in bgs
and you want to level fast and easy and you dont have heirloom items because you are new, SIMPLE.
You do all the quests from the starting area untill lvl 10, then go to goldshire and do those quests, visit the mine with the rat people, etc, and then you head to Westfalls but dont get in that region yet, you will see a tower and a sign with a WANTED mission, take it, kill the boar dudes for both quests (hat and their boss) and then PUFF, you are lvl 16
Do some more quests in Goldshire even if they are low level, get to lvl 18 then go to Duskwood where you do all the quests there untill 28-30.
Next stop: Stranglethorn rebel camp where you take the quests that takes you to the goblin camp and the one that requires the massacre of troll dudes, do these and you get around 35.
Booty
Bay time
, take all the quests from this region and ask a dude to help you kill Gorlash, then kill the pirate dudes and then go to Gurubashi arena and get 2 quests that require killing 2 flying weapons (requires a helpfull dude). Finish all the quests and then....
Easternplaguelands where you will do all the quests from the Light tower or... where you will do all these quests, at lvl 46-47 you will take the gryph to the where you will have to do 2 quests so you can get to 48-49 and then...
Tanaris !!! take the boat from Bootybay and you get to Ratchet from where you take the gryph to Gadgetzan where there is an instant chain quests that will boost you to 58-59.
From here, you will have to HS back home and take the portal to the Black Gate
(this portal is located in the mage tower in SW)
And from here its pretty easy untill lvl 68-69 (just do all the quests in Hellfire Peninsula)
After this, ask a friendly dude to help you finish the quests in Nagrand Arena where you will get to 70-71
Tp home, get the Big Fat Iron Boat from the docks in SW to get to Northrend and there do all the quests again, visit the Nexus region where you do quests, then fly to Dragonblight where in the North of that region (around the icy giant walls) you will find 4 mad goblins, do all those quests except the one with the lumber thing (bugged somehow)
And GRATZ you are lvl 80
Buy some cata greens for your level and head to Hyjal where you will face russians and Horde
beat them while you do all those quests (remember to get exalted with Hyjal here) and then you will be around lvl 84
Tehnically your journey is over
you tp from Sw to Twilight Highlands where you visit that Giant rocky purple arena where you do all those instant quests to lvl 85
If you are 83 in Hyjal, then TP to Uldum where you will do all those quests for rep with Uldum and to get lvl 84.
Hope its usefull for you, take care