What's the best course?

Dear Sirs
As an avid subscriber of your magazine I would be grateful if you would be able to advise me what are the best courses to enrol on preferably home correspondence courses, to become qualified as a behaviourist and what prior qualifications are needed to join the courses if any.  I note there are many animal behaviour courses on line but am not sure which is the correct one to enrol on to gain the recognised qualification.
Many thanks 
Sue Parkin