I did 1-10 starter zones. 10-20 boosted in SFK. 20-40 boosted in SM. Then 40-42/43 Dustwallow - very easy. 43-48 was tanaris/south STV. 48-52 52-54 was cloth turn ins. was Hinterlands. 54-57ish was Ungoro 56-60 was WPL.

I have 2 groups at 60, 1 group at 50 ,1 at 40 and two groups, to get gift levels, at 31 and 21 respectively.