From 60-68 just quest in Outlands and skip every single collection quest.

From 68-71 I went ahead and did Borean Tundra. I just find is better then Howling Fjord for some reason but feel free to do both! Your Rogue should be able to tank most elites with your shammies heal etc so all I can say is get as much rest xp as you can and quest quest quest. In Northrend don't skip the collection quests unless you know they don't lead to any other quest opening or item that you could use.

The only other thing I can tell you is maybe you could grind the Scarlet Onslaught camp in Dragonblight. (Level 71-73 Humans) I did that with my DK out of party with rest XP and was getting like 2.5k xp per kill. I know you would have to remain in group for that but you use TS on Round robin to tag them and then destroy them with your rogue with FOK!.