New to Addon Creation

I recently took interest in creating addons for WoW, and this happened to coincide with the release of the Addon Studio for World of Warcraft. My first project is actually quite a large order, especially for someone who is new to Lua coding.

My main question is how would I go about creating a drop down menu (ala Atlasloot), and then how would I link the various selections from the menu to different relative tables?

Essentially, I'm looking to make a profession encyclopedia for myself that will show everything that can be made by all the professions and also include the materials required for each item.

Any help is appreciated.|||http://www.wowwiki.com/WoWWiki:Interface_customization

http://wowwiki.com/HOWTO:_Use_UIDropDownMenu