I have not quad-kited for a couple of years now, but it was great fun and good experience for me from level 34 to 50 or so. I quadded primarily in Eastern Wastes and Great Divide, and understand that there is great quadding in Cobalt Scar as well.
Firstly, kiting is to kill a mob, usually with damage-over-time spells, while running away from it. You must be faster than the mob or it will catch you and pummel you, preventing you from casting spells. (Necromancers kite the same way, and rangers do so by shooting mobs full of arrows.) Fortunately, druids are well-equipped to be faster by snaring mobs and by casting speed buffs upon ourselves, Spirit of the Wolf and better still wolf form (Hooooooowwwwwllllll!!!!), and later Spirt of Eagle. At most levels, you will be able to kill any blue, white, yellow or slightly red con mob that you can snare. Summoners, however, are another story.
Quad kiting is to snare four mobs at once, herd them into a tight group so that visually they appear to be one mob by running circles around them, then casting an area-of-effect (AOE) spell that damages all four mobs with a single cast. It takes some practice to master this art and I found it tremendously satisfying. The ulthork camp in Eastern Wastes is a great place to learn. You might wish to start by kiting a single ulthork and killing it with your AOE spell, then adding a second and a third and fourth as your skill and knowledge of the zone increase.
Since you are considering classes, know that wizards also quad kite.
There are other places to quad, perhaps into the 60s, that I am not familiar with.
Should you create a druid on the Tunare server, feel free to look me up when you get your first AOE spell and I'll be happy to show you the ropes.