How do I learn new abilities? [closed]
You need to find your class trainer. Since you are a Warrior, the following list of warrior trainers should be what you are looking for.
Warrior Trainers
And since you are likely to have your heartstone in Stormwind at your level, you should check the Stormwind Warrior trainer.
The easiest way to find people in a major city is to ask a guard - they know where everyone is.