You might be wondering what your first zone is going to be like when you begin to level towards 90. These links should prepare you for what to expect while gaining your first level.

http://forum.mmosite.com/thread/2/179/20120111/WoW_50_Zone_Preview_The_Jade_Forest-4f0d4701290730f13-1.html

This link provides quick descriptions of each zone, link to the zones and factions in each zone if you are looking to know what to expect but not spoil to much this link is great so check it out!