If you are playing the WOW gaming for a long time and have become a past master with higher level, you certainly know many wow add-ons. Such as: Atlas Loot Enhanced, Recipe Radar, Dominos, Chat Bar and so on.
The Add-ons can help you play the WOW game simply and give you much more interesting. But do you know how do the add-ons be created and can you write WOW add-ons by yourself? Does it is very simple? Do you want to up these? This article will tell you. There are various API interface in WOW.  You could make UI modifications or can add item hints in the game through applying these API functions.
All the wow in-game guides were written by these API functions. A common wow guide could sell $40 to $100, so it's huge profit if you can write wow add-ons.
As it is, you should do what to begin your development .There are three requirements you need to have.
First of all, LUA is the language applied to write wow add-ons Differ from the common windows programming. So you need to learn a new programming language before start to your programming.
The next, it is necessary to install some applications to set up your developing environment. The official Blizzard UI kit includes Interface Customization Tool. The ADDON Studio for WOW is another tool simply to apply, which is a Visual Studio-like IDE to develop WOW add-ons. The WOW LUA is an in-game LUA scripting environment which consisted of the interactive LUA interpreter and the multi-page script editor. It could print every significant message to the WOW LUA window.
Finally, it is important to have the WOW add-on development guide .It includes widget listing, complete API listing, event listing and so on.