Helpful World of Warcraft links and add-ons
I'm not a good WoW player so I have a few favorite web sites to help me out. Some of these are really basic but some of them have more advance information.
WoWWiki - I really like this website. It's not as indepth for item details like WoWHead but their articles about classes, instances and zones are done well. If you're just starting out, I recommend to read over this site including the excellent WoWWiki Newbie Guide.
WoWHead - There are a few database web sites but I really like WoWHead. If you need to look up any spell or some item you found, this is a great resource. They also have a handy talent calculator, which I highly recommend you use before doing it live. lol
Curse WoW Add-ons - Curse is a great site for WoW add-on's to customize your WoW client UI. While there are hundreds of add-ons you can install I only recommend a few to keep things simple.
DMiniCoords - This is a simple, X Y position add-on for WoW. When questing people will post the location in X Y format, such as 35,72 instead of "go near the big brown rock".
Quest Helper - Quest Helper is a favorite add-on of mine. This will keep track of your quests, then show where you should go, and add a helpful tooltip over mobs you need to kill. I don't recommend you use this if it's your first time playing WoW as you will spoil some of the quest surprises and fun of exploring. It's great if you just want to level ASAP.
Cartographer - This is another map mod but this will unhide the areas of the map hidden without exploring the area. It's handy for questing and leveling, also added more functionality into Quest Helper by adding a GPS style directional arrow.
Auctioneer - Just by choosing a gathering profession you can make some income by carefully selling the items on the auction house. The trick is pricing your items correctly which is what Auctioneer does for you. It's really nice but in the most recent version some of the functions have been changed. I'm not sure but things like automatic pricing is no longer by default (I can't find it) which is one of my favorite features.
X-Perl UnitFrames - This isn't something that's needed but I personally like having a smaller neater UI interface so this works well for me. Also it's very easy to customize.