that sounds like being a salesperson=paid commission=not so good.
customer service is easy, usually you can help the customers so they're all grateful and stuff. but being a salesman, that's what my dad used to do. i wouldn't recommend it cos if you work all day and only make a few sales, you only get paid commission for those few sales even though you worked all day. i'd avoid a job like that. maybe go for something that's just customer service and not sales