Invisibility potion

Hello everybody,

I am trying to lvl chars without suffering any death.

Im lvling hunter (62 right now) but due to flying bug, died at 58, and couple lvls after that, an skull horde killed me again while farming (I wasnt tracking humanoids...) As we well know, sooner or later, there is always the typical funny skull alliance / horde, who only have fun killing low lvls chars, kills you -_-

According to WowHead, Invisibility Potion makes you vanish but when I check between same faction chars, they can see each other... May I know if this works only with hostile units (players or mobs). Does it matter if you are 50 lvls behind?

I am also lvling pala (13 at the moment) and before I reach "dangerous" lvls, I would like to know if there is any other potion, recipe... which could help me to escape from ganks. Not just invisibility but speed, waterwalking, track... Any other useful effect to help me keep count at 0 would be very very welcome :)

Thanks guys.