Traditional Cajun Accordion music is played on a single row diatonic button Accordion. Although this style can be mimmicked to some degree on the Piano Accordion or Chromatic button Accordion it will not sound right and I can't teach you to do it.
If you are interested in taking lessons from me you will need a single row button Accordion in the key of C or D, or (not ideal but you can get started with) a 2 or 3 row button Accordion with one of the rows being in C or D.
I do private lessons from my home in Coburg or via Skype,
please email or call me for more info or addvice on getting the right Accordion. Good Cajun Accordions can be quite expensive but there are some cheaper ones that you can get started on