I used background knowledge from previous retail experience, and stated the different steps it takes to approach a customer, sell items to them and convince them of the benefits of each item. Everyone has a different approach, but it has to be believable and successful. I didn't go in-depth with this answer because I was nervous during the interview, and it probably cost me the position at first.
I mentioned the multiple co-curricular sporting commitments I was involved in at college, the leadership positions I held in my university society, as well as community service. They seemed to be really impressed by my involvement in community service. Obviously don't lie about it because they check your references quite thoroughly. I also mentioned the awards I won for writing and poetry competitions, and the instruments I play in my spare time. These were really generic, no brow-lifts there.
1. For me, as I was so young I didn't have any career goals yet so it was tough to give an answer. 2. I didn't know alot about the business I was applying for so I suggest you do your research. It isn't a make or break question however it is good to go in knowing what business you're applying for e.g.: Who launched the business, what their vision is, how many stores they have etc: