Gray means you already know that skill green means you can learn the skill and red means your skill level is to low to learn the skill at that time.
I'm pretty sure u still have to go to ur class trainer to unlearn. If not there may be an option near where u view ur talents
There is no 'BEST' class in wow. Each class has its strengths and weaknesses and can be overcome by another player who is better.
If you mean combat pets: Hunters, Warlocks, Death Knights, Mages, and to a lesser extent Priests can summon pets with a spell that they learn from their class trainer. If you mean the cute and cuddly non-combat pets: Then bring up your character panel, swtich to the pets/companions tab, and then click the one you want.
There is ain't such word as wow wow in Chinese.
The warlock trainer in Ironforge is in the Forlorn Cavern. To get to the Forlorn Cavern, you can head east from the Mystic Ward or west from the Hall of Explorers.
Every odd level you can got to the trainer and learn new skills
A witch but that is not a class in WoW.
In the online game, World of Warcraft or WoW, there is one class that can use a spell called hex. That class is a shaman, characterized by their versatility, healer/dps status, and mail armor.
Mage
Originally, prior to Cataclysm, you had to talk to a specific trainer. Speak with a Hunter trainer and he will direct you where to go. After Cataclysm, hunters automatically get a pet at level 1.
There really is no answer to this as you are the only person that knows what race and class you want to be.
WOW means cool