Leveling Suggestions - in ORDER
Starting Zone
Second Zone
Should be level 10 now
Northern Barrens
Azshara
Ashenvale
Northern Stranglethorn Vale
Southern Stranglethorn Vale
Should be level 35 now
Western Plaguelands
Eastern Plaguelands
Should be level 45 now
Badlands / Searning Gorge to 51
Swamp of Sorrows to 55
Felwood / Winterspring to 58
Blasted Lands to 60
Burning Crusade content 60-70
Lich King content 70-80
Cataclysm content 80-85
MoP content 85- 90