If you are dwarf, I will forgive you.
If you are human, quit this game, NOW. You dont deserve to play if u cant find Stormwind on a map.
But to answer your question, from Ironforge-Tinker's ward-Underground Tram.
It will lead u to stormwind. Sword Trainer is Woo Ping in the TRADE DISTRICT. (he is in the weapon shop). It is right next to a general goods shop.