Telephone Market Research On Tradesmen

Data to include: I would like an individual to carry to complete 50 questions on Gas tradesmen. It will be a very straight forward, I anticipate to calls to last no longer that 2 mins. The following questions i would like answered

1. How many enquires do you receive each week
2. On average, how many enquires do you turn away week?
3. If a company offered you money for those unwanted leads, would you sell them?
4. If not, why not?

Thanks
Extra notes: