Well since a lot of players just had HoT unlocked for free it stands to reason they could do with some help with the masteries.
It just so happens that a while back I made a guide for players new to HoT, so I will link it here.
I also have a guide on how to train mounts, so for those that just purchased PoF I will link it too.
This is my guide to HoT masteries - enjoy and I hope it helps
And this is my guide to training mounts