Welcome back, Aldarar! I hope you're having a great time with your new Druid so far. ^^
If you have been gone for a long time though, then you may have missed the scaling levelling changes that were implemented in the last year.
Instead of zones being assigned to a specific level, they have now a much broader range and will scale to your character's level. In other words, whereas before as a Night Elf you would likely go from Darkshore > Ashenvale > Stonetalon Mountains, you can now pick any zone you like on Kalimdor or the Eastern Kingdoms. :)
To do that, just visit a major city and find the Quest Board there (usually near an Auction House). That will show you at least 3 options to choose from.
Enjoy your travels around Azeroth again!