So you have this hunter and are lost in the new patch? Here is the short short version to get you up and running. I am not a real theorycrafter so this is not going to be all math. Also it will not really be optimized and might be actually wrong. But it will get you up and running.
So the new thing is Focus. Mana is out and Focus is in. It works a lot like the ‘Energy’ that Rogues and cat druids use. This means it fills up fast and drains out even faster. The hunter version of this, focus, fills up about half as fast and rogue energy. So you can’t just wait for it to fill and expect to do any damage. The way you manually fill it up is to use Steady Shot.
So Steady Shot fills it up and other stuff drains it out. You don’t want to keep it full because that means you are not getting the most out of your focus. Right off you can see that you will need to be casting Steady Shot all the time. Think of your rotation as SS, SS, something else, SS, SS, southing else. What that other thing is depends on your spec and all that jazz.
I have been experimenting with using Arcane shot and/or Kill Command as my ‘something else. Also I put on serpent’s sting and use Chimera Shot whenever it is off cooldown and I have enough focus.
That is pretty much it. There is lots of optimization to do but that is what I said it would be, the short short version to get you up and running.