Hello Linda, and welcome to this blog, where people from all over the globe who share the love of Cajun music & culture, and diatonic accordion congregate.

Regarding your question. As a beginner, I would definitely recommend the two DVD (or videos) from Dirk Powell. These are known to be the best tools to start on a solid ground on the technical side.
There are several posts on this forum which will provide you with more details. BTW, what key if your new box? FYI, the most prominent key is C.

Salut et à la prochaine...:-)
Maz

Hi Maz!

My accordion is being made in the key of D. Junior Martin had me sing and determined that C would be too low for me. Do you think that will be a problem if most of these are in the key of C?