0 --> 75 elwynn Stonefield farm
75 --> 110 westfall Furlbrows Pumkin Farm
110 --> 180 Duskwood from Ost to West near the river between duskwood and elwynn (First the lvl 20-21wolfes then the bears)
180 --> 225 Northern Stranglethorn kill the Tigers, Raptors. It will take some time in the end but its still effective, fast and easy to do by your own.