First, I think its great that you show an interest in being good at your job and are seeking advice.

As for the married thing - you could ask "and who is going to be the primary driver?" - followed by "just as a formality, is there anyone else who's name will be on the paperwork?"

I think one big thing would be to be honest and not bluff when you don't know the answer to something. If you can't answer the question - saying "I don't know, let me find out" is much better than a b.s. answer.

Another thing I don't like is when salespeople bash another brand. Especially if its a brand that I own or have owned. Say for example that I was trying to decide between an Explorer and a Honda Pilot - I would have much more respect for the salesperson who said - "yes, the Honda is also an excellent choice".

anyway, best of luck to you in your new job.