Speak with Harry Burlguard in Stormwind.
You've shown yourself to be a competent warrior, <name>. But you're still young and have a lot to learn.
Speak with Harry Burlguard--he's usually in the Pig and Whistle tavern, in the Old Town of Stormwind. Harry is an old veteran and a good teacher. He can show you a few moves that'll keep you breathing longer.
Oh ho! Have a drink with me, <name>. You look tough on the outside, but let's see if your gut can handle a few mugs of the Pig and Whistle's strongest!!
Or... were you here for a lesson?