[Scandal]

I check the articles' section and I found usefull for the development of products, the following (but I have more basic level questions):
[How to] Install Plug-ins/Hooks
Manage Templates
How to create your own vBulletin-powered page! (uses vB templates)
vBulletin Template Conditionals
vBulletin Variables List
HowTo Create Custom Usergroup Permissions
Custom Script need WOL Location, EASY
Create pages for the AdminCP
Adding Currently Active Users to your own vB page
[How-To] vBulletin API Basics: Creating Custom Pages & Misc.
Intergrating AJAX Technology Into Your Modifications
[How to] Write Plug-ins/Hooks
[How-To] Add entries to AdminCP Navigation Menu
Template Hook
Using VBulletin 3.7.x notifications engine
Variable's For Beginners
How not to modify templates
How To Include A Custom Template Via Plugins
[vBulletin|PHP]vBulletin options and conditionals
A Closer Look at Bitfields
Create Secure Mods

.. Also, I don't had seen the Appendix 4: Developer Tools of the manual. I'll read it!!

Thanks, I'll check some ready products to see how works!