Start by heading to the Western Plague-lands
50-55: Keep working on the quests here in Ungoro until level 52. Give one last wave to Kalimdor and head to northern Azeroth. Start by heading aion gold to the Western Plague-lands and basing yourself at Chilwind Camp.
There will only be a few yellow quests at this point so when you reach 53 or are close to 54 head to Winter-spring and Ever-look. Do most of the yellow quests here but don't bother after level 55.
Another good idea is to grind on mobs that bring in the most cash. Humanoids drop money and cloth and have a slightly higher chance of dropping green armor and weapons. Beasts will only drop animal parts that don’t sell for much. But if you are a skinner you can make money that way.
55-58: Return to the plauge lands and finish up any quests at Chil-wind point. Each of the farms in the northern half of the zone also has some quest givers so make sure to check them carefully. When you are done you should be near or just past level 56. Take the road east and head towards the Eastern Plague-lands.
Keep following the road until you near an abandoned town Called Corwin’s Crossing. Go around it and keep heading east and north until you find Lights Hope Chapel. After you have established a base there load up on quests and head out to finish them.