1. This is all about preference. Whatever makes it easier for you to preform the Jump-Shot is how you should have your buttons arranged. Hotkeys are a must, so you can continue to move, jump, turn around, fire a shot, turn back, and keep running. You really only have to turn enough to fire at them, it's not even a full 180, just a 90 degree turn would be sufficient, but definately practice on a mob.
2. Your biggest problem will be people in front of you obviously. As a hunter you always need to look for your exits, and points of least resistance. What this means is, before you go into attack, look at the others around you. Are there people behind you? Are your allies close by? Could you run to them easily?
Look at your options and always make sure you have enough room to run around in. If there's 1 person in front of you, and 3 behind you, it might be better to run to the person in front of you, Wing Clip them, and continue running past them. Again it all depends on the situation.
3. Kiting is very dependant on how far away they are to you. For a rogue you want to keep them at a distance so they can't "Blind" you and get close. You need to stay out of casting range for most casters such as Warlocks, Priests, Shamans, Druids, Mages, and Paladins. You definately need to stay out Charge and Intercept range from warriors. For other hunters it's more or less a stand off and running from them will allow them to get more Auto-Shots as you're attempting to run away.
Best suggestion is to get to know your ranges. Research the other classes a little more and find out exactly how far they can reach with their spells and abilities. Mages and Hunters can get the most range, so it's important to either stay out of that range, or be prepared for a fire fight.
Concussive Shot, Frost Trap, Arcane Shot, Serpent Sting, Wyvern Sting, Scatter Shot, Silence Shot, Multi-Shot, etc. All of these can be used while kiting if you have enough room. You can even pump out a few Auto-Shots before they get close too. The key is always stay at a distance, because up close we can't even compete.
It's more or less a judgement call on your part. If you feel you have enough space and time to fire off a few auto-shots by all means go ahead, but if you see that mage blink next to you while you're trying to fire off another shot, it's probably best to start running away.
If you have 5 people chasing you, it's probably a better bet to run back to your friends and attack with your group rather then trying to kite all 5 of them running after you.
You will die, have no doubts about that, but if you can stay at ranged combat for as long as possible then you'll help wittle and kill the other side.