+hit until he hits at least 10% with talents (so 7% +hit from gear, 3% from talents). after that, hit becomes incidental to crit, AP, and str. however, hit isnt useless; its just something you dont really want to focus on. this is all for equal level mobs btw. for raiding, he'll need about 13% to hit with talents.
as for what his bar should look like, thats up to him. probably put the most used attacks nearest his main movement keys. for me, thats 1/2/3/4 being bloodthirst, whirlwind, victory rush and pummel. Q and E are charge/intercept and hamstring respectively. [ is slam, ] is heroic fury, as they tend not to be used quite as much, and when i do need to use them i have a bit of time to think about using them, hence the placement of the key.
R is my battle stance/overpower macro, and ~ (the key to the left of 1) is my disarm/defensive stance macro. Y is shield swap + spell reflect macro. death wish is bound to shift+2, with zerker rage on shift+3.
his mileage may vary. have him do a lot of duels or spend some time on the training dummies until he finds a rotation and setup that feels comfy to him.