Destro:
WoW is one of the most "noob" friendly mmorpgs I've played. Your hand is pretty much held through the first few levels where you learn the ins and outs. Here are a few tips.
1. READ YOUR QUEST LOG!! I cannot stress this enough. You will find all the information you need to know for all your quests here. Sure you may have to wander around looking for a specific spot but the info provided there is more than enough to start off.
2. Guards in towns will show you the way. If you click on a guard you will get a dialog box. You can then ask him about any type of npcs in the town. Say you ask where the Hunter trainer is, they will tell you and then a dot will appear on your map.
3. Take as many quests as you can(you can have up to 20). Most of these quests will involve killing things you'll be killing anyway or collecting things that they drop. Trust me, the quests are worth the XP....and sometimes the reward.
4. Dont be afraid to group. Groups are a good way to get a quest that is a bit high for you completed. Some people will just invite you without asking, if you're adverse to this just decline and whisper to them you do not want a group. I don't really care if they ask or not, once in the group I find out what is going on, if they're working on the same quest why not help each other out...it is a mmorpg after all.
5. Try to keep out of the general chat dumbassery( I just made that one up) You'll see what I mean after 5 mins of being in game.
6. Go PvP. Kill Alliance scumbags.
7. Get
Cosmos UI . It blows away the default UI. You may want to wait few on this though, until you're ok with the game.