So Druid plays very differently based on which spec you choose, but the general idea is fairly simple.
If you go Balance, your abilities generate solar or lunar energy, and you move back and forth between eclipse states. What this means is that you want to keep Moonfire/Sunfire on the target, and alternate between spamming Wrath and Starfire, depending on which eclipse state you are in. Use Starsurge whenever it's off CD. That's really about it. There are some more advanced things you can do, when you get more skills, but by the time you get those you'll have a deeper understanding of the class.
You'll want to wear leather armor, and your primary stat is intellect. Carry water with you, in case you need to recover mana.
If you go Feral, you'll want to level in your Cat Form. As a cat, you use energy and combo point resources. Some builds use energy and build combo points, finishers use combo points to give burst damage or an effect. You'll want to Rake the target to put your Damage over Time effect up (and reapply Rake whenever the DoT is about to fall off). Otherwise, use Shred or Mangle to build combo points (Shred you can use when you ambush a target from prowl, or whenever you are behind them). Use Ferocious Bite when advantageous to do so (have high combo points, have sufficient points to kill the enemy, etc.) When you level you'll gain access to other finishers, most notably Savage Roar. Just keep that up at all times and try to chain enemies to maximize the effect.
Guardian uses Bear form as a tank. Once you get comfortable in groups, you can try your hand at tanking. Bear melee attacks will generate Rage, which you can expend to power other skills. By the time you reach the point where you can start tanking, you should be able to look at your abilties and get the general idea of what to use, when.
Same with Restoration, the healing spec. I advise waiting until you're used to the game and group combat to play as a healer. It'll just work out better for you.
Regardless of what you pick, don't forget you can shift to humanoid form to cast Restoration for some healing when you need it.
Anyways, you all are horrible, @#%^ed up people