If you play wow you should know about the different sites that came help you with almost all your questions about wow (drop rates, item stats, what to do for quests and much more).
I prefir thottbot.
Download the thottbot cosmos from the link below, install and make sure you allow it to run as an addon when you have opened up wow. Now you can start contributing today!!!:grin:
Thottbot World of Warcraft: How to Contribute to Thottbot
If this is your first addon, its easy to make it work. You have to download into the correct file. It is World of Warcraft\Interface\Addons (There should be some files in there already, DONT touch them!) Once the file has downloaded, open up the zipped folder, "cut" all the files and "paste" them into the, World of Warcraft\Interface\Addons folder. now start wow, log in and at the character sellect screen, there will be a botton called Addons in the bottom left corner. Check the box and then your addons should load once you enter the world.
Have fun and a little tip: take everything in moderation, Except world of warcraft!!!