For Survival Hunter, there are two standard shot rotations for him, one is a 1:1.5 rotation which includes arcane/multi-shot to supplement your auto/steady rotation and another is a heavy steady shot rotation which utilizes just auto and steady shot but with the appropriate macro will adjust to haste effects and take advantage of the ability to delay an auto-hot. Which one is the best fit for you will depend on your gear level and spec. For most survival hunters, the preferred shot rotation is a 1:1.5 rotation whereas a heavy steady shot rotation becomes preferred at higher levels of gear.
For more general information about shot rotations you wan to know, we will tell of them in depth which we should give you some idea of the basics of shot rotations and many more details there about the heavy steady rotation.
A 1:1.5 rotation means that for every other steady shot you want to squeeze in a special arcane or Multi shot before the next auto shot goes off. So it should look something like this: Auto Shot, Steady Shot, Arcane or Multi Shot, Auto Shot, Steady Shot.
It's difficult to macro a 1:1.5 rotation well, although macros for it do exist you're better off using a macro to create a 1:1 Auto/Steady rotation and then manually insert your specials as needed.
By using a macro does not include a cast-sequence, you can opt to clip some autos in order to achieve more total damage through steadies. The macro will automatically adjust to haste effects and tighten the rotation. By default the macro will create a rotation of 2:1 at 2.5s draw-speed and under haste effects it will reduce to 3:2 at 2.1s draw-speed or 1:1 at 1.9s draw speed depending on the haste effect and your base shot speed.
How this works is somewhat odd. There is a hidden cast time of 0.5 seconds built into auto-shot, but it is started at the appropriate time for auto-shot to continue firing. if your auto-shot speed is 2.5 seconds, it will automatically start firing your auto-shot at 2 seconds, even if a steady shot is in the process of casting. If your auto-shot is delayed it will go through at the next possible opportunity. Haste reduces your steady shot and auto-shot casting speeds, but not your global cool-down. Due to it, the gap created between your steady shots is where auto-shot will fire assuming that the hidden cast has completed. Note that spell haste effects can reduce your global cool-down up to the 1 second cap.
Whether the heavy steady rotation will generate better damage than a 1:1.5 rotation will depend. It's recommended for those with a 4 pc T6 bonus and a Dragon-spine Trophy, plus sufficient haste to make the steadies balance cleanly, there are reports that it may also work at lower levels of gear. If you are using a heavy steady rotation you will want to go either with an imp hawk spec or a readiness spec, as you are removing arcane and multi out of your rotation for the most part so deep marksmanship specs are not a good fit. Your latency may also have a significant effect on the effectiveness of this rotation for your DPS.
It is possible to get into a situation by using the heavy steady rotation where you are chaining steadies without auto-shot getting off due to pushback or other factors. If this happens you may need to use an arcane shot to force a global cool-down to allow auto-shot to squeeze back in and steady shots to return to a more appropriate balance. If you find that you are consistently chaining steadies you may need to add more haste to create more delay between your steady and auto shot.