When I boost RAF toons this is the format that I usually follow as it works best for me:

1 - 10: Questing

Horde:

10 - 21: Ragefire Chasm
21 - 35: Scarlett Halls

Alliance:

10 - 20: Deadmines
20 - 25: Stockades
25 - 35: RFK

Both Alliance and Horde:

35 - 45: RFD
45 - 60: Sunken Temple
60 - 68: Blood Furnace
68 - 77: Nexus
77 - 85: Blackrock Caverns
85 - 90: Temple of the Jade Serpent