In what order should I complete the course?

It's best to start with First Principles as these are the building blocks of the Reluctant Salesman approach.

The Four Keys moves you on a bit further towards putting the learning into practice. Both of these courses are within 'Freedom'.

Then the two courses in Process - Find and Win Clients; Keep Clients - will propel you into very practical applications of the approach.

There's a more detailed description of each part of the programme here.