Where i should lvl up after 40?

[Marrow]

I upped 40, so now i should go to thousands needles to continue. Now i have quest: To The Summit, i should talk to flight master in dustwallow Marsh, but when i trying i getting: You dont know any flight positions connected to this one. So where should i up now?

[woloss]

You can go to Thousand Needles by the your own feet or mount. After this loc., you go to Tanaris and so on.

Flight paths broken here a bit.

[Islingr]

they're not "broken" they're just not 'learned automatically' as they should be in 4.3.4, but yes, thousand needles and then tanaris, un'goro, silithus, blasted lands... then you're off to outland

[Saisona]

for future if you are stuck and don't know where to level, a very nifty addon is Carbonite, basically tells you what level is what area ect.