The target is Razorfen Downs located in the southern barrens, this instance is for about levels 35-45.

To do this run you need to be a rogue level 60 (maybe a bit below) and you also need to have enchanting
When you enter the instance go into stealth and follow the map outlined (it may be a bit incorrect but u get the idea, just get to the last boss)

http://img295.imageshack.us/my.php?image=86full4fy.jpg