Your weapons don't change how much Rage you generate anymore, but auto attacks are still a big share of your damage, so keep upgrading weapons. Critical strikes with basic attacks give 100% more Rage (1 Oct), and the 8 Oct notes fixed several bugs so warriors now gain more Rage from taking damage.
Spend Rage carefully
Heroic Strike and Cleave look big but give poor value for their Rage. Wowhead's tester recommends saving Rage for Sunder Armor and Overpower, not dumping it into Execute as a pack dies. Don't be afraid to take hits in dungeons; you're sturdy, and damage taken refills your Rage.
At 30 you get Berserker Stance (more crit, more damage taken) through the class quest from Klannoc Macleod, which ends with a fight against Big Will. Berserker Rage is now learned at 30 (was 32). The next step sends you to Bath'rah the Windwatcher in Alterac Mountains for the Whirlwind Weapon chain: 8 Liferoot, 30 Bloodscalp Tusks and an Essence of the Exile, then the elite Cyclonian. Whirlwind itself isn't in your kit at 30 in the beta.