Hunters rely mostly on their ranged attack power to deal massive damage to enemies. Unlike most classes, hunters gain 2 attack power for every 1 agility, making agility by far the best stat to focus on. Intellect also helps them by increasing their mana for more powerful shots, and with the right talent build, it also increases attack power. I recommend focusing almost entirely on agility for your stats. Searching for green items "of agility" on the auction house will yield good agility gear.