[shkm]

You might want to try adapting a more open attitude. Chances are the first addon you wish to create isn't going to yield you buckets of cash or fame. Hell, chances are you'll never get either from addon dev. You're probably best off throwing the idea out there to learn just what you need to learn to pull it off. That, or you could ask for small pieces of advice rather than the whole thing.

In any case, tips mentioned have been sound. Buy Programming in Lua -- buying a book gives you more incentive to read it -- and flick through it on a rainy day. Start with a simple function that you'll probably adapt into the main addon and see how you get along. Chances are there'll be a lot of re-design and a lot of learning. Use WoWProgramming and WoWWiki as your documentation.