Truly, you can start with any class as we recommend you make each and every class your own and modify poses when ever you need to! For those of you that like to take things a little slower initially, we suggest you start off with a few 60 minute Moksha classes and then feel free to explore the other class types we have.
Ngosuani - http://reports.freethechildren.com/community/ngosuani/
Oloirien - http://reports.freethechildren.com/community/oloirien/
Osenetoi - http://reports.freethechildren.com/community/osenetoi/