Im a lvl 27 hunter in World of Warcraft with a lvl 27 pet and best possible armor but im trying to get to lvl 30 to get a mount. can anyone tell me what to fight or what quests to do

Quests are your quickest way to get leveled up if you're looking for speed.

Pick up a free WoW in-game Questing addon like Carbonite (see link below) and it'll make finding those difficult quest mobs WAY easier.

Learn how to make use of your traps and hunter pets to the max - there's a reason why the fastest-leveling classes from 1-80 tend to be Hunters, but also a reason why there's so many terrible hunters about!