Anyone know of a website for learning VBA in PowerPoint?

I can do a few things with PowerPoint, but I need to learn more about the following:

• Adding a new textframe and text, and placing it where I want to on the slide.
• How to use VB to control the master slide.
• Add text to the notes field.

What resources and tutorials are available to help me with those items?

Perfect for beginning PowerPoint VBA.