I would tend to agree with those who have posted questioning why the OP has asked us if he is the one who plans to enter into business......
If this posting is legit, ..My suggestion is the Sell CUSTOMER SERVICE, ...this is completely lacking in almost every segement of business this day....where I live, the norm is poor customer service, whether it be at the dollar store or at the Ferrari dealership, across the board. I have expericned in the past year, 10% of the places I have frequented to have expectional customer service and 90% to be unacceptable.