Are the company looking for people to work with customers to ensure that the customers choose to buy there, buy only what's genuinely a good product for them and thus tend to return for repeat business?
Or are they looking for people to talk customers into buying whatever is most profitable for the business and as much of it as possible?
Two quite different jobs, with different usage of skills required. One problem for you will be that they'll say they want the former anyway, even if they want the latter.
Either way, you'll need product knowledge and people skills.
You have to know your products better than nearly all of your customers do, so that you can answer their questions and thus establish your credentials in their minds. There's no point being there if the customers don't see you as someone with answers. If you don't have the answers, you're just in the customer's way as they make their choices or, more likely, go somewhere else where they can get answers.
You have to be able to assess a specific customer's level of knowledge and intelligence and tailor an explanation to fit them. Get it wrong and they'll see you as either patronising, useless or both. Metaphors can help with people who don't know anything about computers by connecting stuff they don't understand to stuff they do understand. So, for example, RAM is like having stuff written on your hand - you can look at it very quickly, but you can't fit much on and it's temporary, whereas HDD space is like a big notebook in your bag - it takes longer to find the stuff on it, but you can fit a lot more on and it stays there until you rub it out and write something else over it.
Listening to customers talking about what they want (many won't really know) and asking relevant questions to get an accurate picture of what they really want is also key. If they get the impression that you're using your expertise to advise them on what's best suited to what they want, they're more likely to buy.
Customers don't like being pressured into buying add-on stuff (warranties, extra software, etc), but it's profitable. People skills will allow you to manipulate customers into buying stuff whether it's useful for them or not, but they'll also allow you to assess whether it is useful for them or not and explain it to each customer in a way that they will understand so they can choose for themselves.
So the actual job can vary wildly depending on the company's approach to selling, but the same skills apply to both - product knowledge and people skills.
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