If you're rage starved the first thing you'll want to cut back on is Heroic Strike. Without a steady supply of incoming damage (which at your level nothing hits hard enough to give you infinite or near-infinite rage) Heroic Strike can be a real rage hog because it both costs rage to use and also denies you the rage you would have gotten from the white hit it replaces. To boost your rage income you should use Berserker Rage every cooldown and Bloodrage with the minor glyph (I LOVE that glyph now).
As for rotation, open with a Shield Slam, Devastate until SS cools down, Shield Slam again and repeat. Since you don't have Sword and Board yet you're stuck with the 2344 rotation, that being Shield Slam, Revenge if it's lit up, Devastate Devastate and repeat.