You have probably been told (if you listen to the right people) that questions are the basis of selling.
The question becomes “What questions?”
On my website I have a summary of SPIN Selling which is a sales model based on asking specific types of questions.
You can access that page by clicking on this link to SPIN Selling.
There is also the question about how to ask your questions.
Have a look at the video below by Mark Hunter author of “High Profit Selling”.