How to appear for Sales / Business Development Interview?

I was delighted when Sanil and Dexter from the information management class of 2nd year PGDM came to me on Friday and said that there was a strong recommendation from the last year students - who attended my elective course on "Customer Acquisition" - that they found my teaching very practical and useful during their internships and their jobs in the industry. I immediately agreed to hold the class very next day but without an outline ... I said the title will be "Q&A with Prof Palekar". The 2 sessions went off very well. I too enjoyed immensely. This was the first time that the students were being taught by me and normally the class is naturally wary of a new teacher. In this case it was the opposite - in the first 2 minutes itself I realized I was welcome and wanted. What more does a teacher want ?