VBA Schools

RE: Is there any online or schools that offer good VBA training?
Just Google for VBA Tutorials and see which approaches suit your learning style. Here's one that I like:
http://datapigtechnologies.com/ExcelMain.htm

RE: How does one acquire a MVP credential?
Which kind of MVP? Website specific or Microsoft MVP?

Useful links below

VBA Noob

From the Microsoft website:

What are Most Valuable Professionals (MVPs)?
.... These are individuals who have received the MVP award for their positive impact in the technical and product communities they participate in. They are viewed by their peers and by Microsoft as credible experts who provide accurate technical answers while sharing a common passion for technology.

MVPs are individuals from around the globe recognized by Microsoft for their demonstrated technical expertise and active participation in Microsoft peer-to-peer communities like discussion groups and message boards. These individuals represent a wide variety of backgrounds and professions, but they share the basic characteristics of having very strong technical skills in one or more Microsoft products or technology areas and the willingness to share that knowledge with others. MVPs are recognized for their past contributions to one or more online communities and many times are also prominent authors, developers, industry "gurus" or speakers.

The enthusiasm of the MVPs combined with their positive contributions exemplifies the spirit of strong communities.

As of the beginning of August 2007, there were 116 Excel MVPs, globally (36 in the USA):

I hope that helps.
(If you need more information, PM me)