Honestly, WoWWiki probably has the most complete reference to the WoW API's of any website source. There is also a website on Programming for WoW, that hosts a lot of the FrameXML and Lua code provided for constants and Blizzard's UI elements. (wowprogramming.com)
between those, and the sites listed as Lua resources on WoWWiki's "Lua" page, and programming experience, you should be able to figure out what's needed.
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-- Taryble
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