When you're leveling just try to get enough Str. Also, Weapon Damage (well, weapon DPS at least) makes a huge difference for Warrior. Haste sucks, but not so much that you should pass on an upgrade if it gives you more STR. The rest will take care of itself until you hit 85.
Stam is only important on leveling gear because of Victory Rush and will come naturally on gear based on higher ilvl.
In terms of rotation, it really depends on Arms versus Fury, but I will say that Colossus Smash is amazing and should be used pretty much as often as possible. Mortal Strike (Arms) and Bloodthirst (Fury) are both high priority attacks and should normally be hit on CD if possible. Heroic Strike is not as good as it used to be and should only be used if you're sitting at 75+ rage. If you're Fury, remember that Berserker Rage counts as an enrage and can be used to let you Raging Blow.
Outside of that, we'd need to know what spec/gear you're using and any specific problems you're having, like Moonkissed had said.