1-6 points into WW or until the damage percentage is at 0 and not negative.
Concentration and a point into Berserk, from there the rest is Battle orders and synergies. Also the normal skills, mastery and what not.
The way I play barb is different.
Concentrate for single targets, bosses* 1 pt Berserk for physical immune unless you rather use elemental and poison for damage. WW is for mobs obviously. 1 point into item find or a helm with the skill.
As for gear there are many rune words that are good for early.snd late game.
Personally greif is a waste unless you're dueling.