Speak with Nessa Shadowsong.
A friend of mine, Nessa Shadowsong, is a fishing merchant in Rut'theran Village. She needs a parcel taken to Darkshore, and is looking for someone to help her.
If you're interested, then to reach Nessa you must take the portal in Darnassus to Rut'theran Village. You will find the portal west of the Temple Gardens.